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This article is about the concept of time. For the magazine, see Time (magazine). For other uses, see Time (disambiguation). Sunrise shown in time lapse. The motions of Sun and Moon have demonstrated and symbolized time throughout humanity's existence.[1] The flow of sand in an hourglass can be used to keep track of elapsed time. It also concretely represents the present as being between the past and the future. Time is a basic component of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects. Time has been a major subject of religion, philosophy, and science, but defining time in a non-controversial manner applicable to all fields of study has consistently eluded the greatest scholars. TIME redirects here. ... Look up Time in Wiktionary, the free dictionary. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... A typical sunrise, in New Zealand A sunrise through clouds over Oakland, California. ... The flower of a geranium opening over a period of about two hours. ... Sol redirects here. ... This article is about Earths moon. ... For other uses, see Hourglass (disambiguation). ... Present may mean: present (time): time that is neither past nor future a gift: thing given free of charge, gratis This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... The past is the portion of the timeline that has already occurred; it is the opposite of the future. ... For other uses, see Future (disambiguation). ... For other uses, see Philosophy (disambiguation). ... A magnet levitating above a high-temperature superconductor demonstrates the Meissner effect. ... In physics and other sciences, time is considered one of the few fundamental quantities.[2] Time is used to define other quantites – such as velocity – and defining time in terms of such quantities would result in circularity of definition.[3] An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, has a high utility value in the conduct of both advanced experiments and everyday affairs of life. The operational definition leaves aside the question whether there is something called time, apart from the counting activity just mentioned, that flows and that can be measured. Investigations of a single continuum called space-time brings the nature of time into association with related questions into the nature of space, questions that have their roots in the works of early students of natural philosophy. A magnet levitating above a high-temperature superconductor demonstrates the Meissner effect. ... A set of fundamental units is a set of units for physical quantities from which every other unit can be generated. ... This article is about velocity in physics. ... A circular definition is one that assumes a prior understanding of the term being defined. ... An operational definition is a showing of something—such as a variable, term, or object—in terms of the specific process or set of validation tests used to determine its presence and quantity. ... This article is about the unit of time. ... In special relativity and general relativity, time and three-dimensional space are treated together as a single four-dimensional pseudo-Riemannian manifold called spacetime. ... This article is about the idea of space. ... Natural philosophy or the philosophy of nature, known in Latin as philosophia naturalis, is a term applied to the objective study of nature and the physical universe that was regnant before the development of modern science. ... Among prominent philosophers, there are two distinct viewpoints on time. One view is that time is part of the fundamental structure of the universe, a dimension in which events occur in sequence. Sir Isaac Newton subscribed to this realist view, and hence it is sometimes referred to as Newtonian time.[4][5] The opposing view is that time does not refer to any kind of "container" that events and objects "move through", nor to any entity that "flows", but that it is instead part of a fundamental intellectual structure (together with space and number) within which humans sequence and compare events. This second view, in the tradition of Gottfried Leibniz[6] and Immanuel Kant,[7][8] holds that time is neither an event nor a thing, and thus is not itself measurable. For other uses, see Universe (disambiguation). ... 2-dimensional renderings (ie. ... For other senses of this word, see sequence (disambiguation). ... Sir Isaac Newton in Knellers portrait of 1689. ... Contemporary philosophical realism, also referred to as metaphysical realism, is the belief in a reality that is completely ontologically independent of our conceptual schemes, linguistic practices, beliefs, etc. ... In physics, the concept of absolute time and absolute space are hypothetical models in which time either runs at the same rate for all the observers in the universe or the rate of time of each observer can be scaled to the absolute time by multiplying the rate by a... This article is about the idea of space. ... For other uses, see Number (disambiguation). ... Leibniz redirects here. ... Kant redirects here. ... Temporal measurement has occupied scientists and technologists, and was a prime motivation in navigation and astronomy. Periodic events and periodic motion have long served as standards for units of time. Examples include the apparent motion of the sun across the sky, the phases of the moon, the swing of a pendulum, and the beat of a heart. Currently, the international unit of time, the second, is defined as a certain number of hyperfine transitions in caesium atoms (see below). Time is also of significant social importance, having economic value ("time is money") as well as personal value, due to an awareness of the limited time in each day and in human lifespans. In many countries, Technologists are synonymous with applied scientists or engineers. ... This article is about determination of position and direction on or above the surface of the earth. ... For other uses, see Astronomy (disambiguation). ... This article is about the unit of time. ... In atomic physics, hyperfine structure is a small perturbation in the energy levels (or spectra) of atoms or molecules due to the magnetic dipole-dipole interaction, arising from the interaction of the nuclear magnetic dipole with the magnetic field of the electron. ... General Name, Symbol, Number caesium, Cs, 55 Chemical series alkali metals Group, Period, Block 1, 6, s Appearance silvery gold Standard atomic weight 132. ... The time value of money is the premise that an investor prefers to receive a payment of a fixed amount of money today, rather than an equal amount in the future, all else being equal. ... In biological psychology, awareness describes a human or animals perception and cognitive reaction to a condition or event. ... This article is about the measure of remaining life. ... Contents 1 Temporal measurement 1.1 History of the calendar 1.2 History of time measurement devices 2 Definitions and standards 2.1 World time 2.2 Sidereal time 2.3 Chronology 3 Time in religion and mythology 3.1 Linear and cyclical time 4 Time in philosophy 4.1 Time as "unreal" 5 Time in the physical sciences 5.1 Time in classical mechanics 5.2 Time in modern physics 5.3 Spacetime 5.4 Time dilation 5.5 Relativistic time versus Newtonian time 5.6 Arrow of time 5.7 Quantised time 6 Time and the Big Bang 6.1 Speculative physics beyond the Big Bang 7 Time travel 8 Perception of time 8.1 Time in psychology 8.2 Time in altered states of consciousness 8.3 Culture 9 Use of time 10 Notes and references 11 See also 11.1 Special units of time 11.2 Books 11.3 Organizations 12 Further reading 13 External links 13.1 Perception of time 13.2 Physics 13.3 Philosophy 13.4 Timekeeping 13.5 Miscellaneous [edit] Temporal measurement Temporal measurement, or chronometry, takes two distinct period forms. The calendar, a mathematical abstraction for calculating extensive periods of time,[9] and the clock, a concrete mechanism that counts the ongoing passage of time. In day-to-day life, the clock is consulted for periods less than a day, the calendar, for periods longer than a day. Wikipedia does not yet have an article with this exact name. ... For other uses, see Calendar (disambiguation) A page from the Hindu calendar 1871–1872. ... For other uses, see Clock (disambiguation). ... [edit] History of the calendar Main article: Calendar Artifacts from the Palaeolithic suggest that the moon was used to calculate time as early as 12,000, and possibly even 30,000 BP.[1] For other uses, see Calendar (disambiguation) A page from the Hindu calendar 1871–1872. ... The Paleolithic or Palaeolithic – lit. ... Before Present (BP) years are the units of time (counted backwards to the past) used to report raw radiocarbon ages and dates referenced to the BP scale origin in the year AD 1950 (identical to 1950 CE). ... The Sumerian civilization of approximately 2000 BC introduced the sexagesimal system based on the number 60. 60 seconds in a minute, 60 minutes in an hour – and possibly a calendar with 360 (60x6) days in a year (with a few more days added on). Twelve also features prominently, with roughly 12 hours of day and 12 of night, and 12 months in a year (with 12 being 1/5 of 60). Sumer (or Å umer; Sumerian: KI-EN-GIR [1]) was the earliest known civilization of the ancient Near East, located in lower Mesopotamia (modern Iraq), from the time of the earliest records in the mid 4th millennium BC until the rise of Babylonia in the late 3rd millennium BC. The term... The sexagesimal (base-sixty) is a numeral system with sixty as the base. ... The reforms of Julius Caesar in 45 BC put the Roman world on a solar calendar. This Julian calendar was faulty in that its intercalation still allowed the astronomical solstices and equinoxes to advance against it by about 11 minutes per year. Pope Gregory XIII introduced a correction in 1582; the Gregorian calendar was only slowly adopted by different nations over a period of centuries, but is today the one in most common use around the world. For other uses, see Julius Caesar (disambiguation). ... For other uses, see Roman Empire (disambiguation). ... A solar calendar is a calendar whose dates indicate the position of the earth on its revolution around the sun (or equivalently the apparent position of the sun moving on the celestial sphere). ... The Julian calendar was a reform of the Roman calendar which was introduced by Julius Caesar in 46 BC and came into force in 45 BC (709 ab urbe condita). ... Intercalation is the insertioffn of an extra day, week or month into some calendar years to make the calendar follow the seasons. ... “Summer solstice” redirects here. ... For other uses, see Equinox (disambiguation). ... Pope Gregory XIII (January 7, 1502 – April 10, 1585), born Ugo Boncompagni, was Pope from 1572 to 1585. ... For the calendar of religious holidays and periods, see liturgical year. ... [edit] History of time measurement devices Horizontal sundial in Taganrog (1833) Main article: History of timekeeping devices See also: Clock A large variety of devices have been invented to measure time. The study of these devices is called horology. Image File history File links Sundial_Taganrog. ... Image File history File links Sundial_Taganrog. ... For other uses, see Sundial (disambiguation). ... Taganrog (Russian: , IPA: ) is a seaport city located on Taganrog Bay in Rostov Oblast, Russia. ... For other uses, see Clock (disambiguation). ... Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea In physics and engineering, measurement is the activity of comparing physical quantities of real-world objects and events. ... Horology is the study of the science and art of timekeeping devices. ... An Egyptian device dating to c.1500 BC, similar in shape to a bent T-square, measured the passage of time from the shadow cast by its crossbar on a non-linear rule. The T was oriented eastward in the mornings. At noon, the device was turned around so that it could cast its shadow in the evening direction.[10] A T-square is a technical drawing instrument primarily a guide for drawing horizontal lines on a drafting table. ... Noon is the time exactly halfway through the day, written 12:00 in the 24-hour clock and 12:00 noon in the 12-hour clock. ... A sundial uses a gnomon to cast a shadow on a set of markings which were calibrated to the hour. The position of the shadow marked the hour in local time. For other uses, see Sundial (disambiguation). ... The cantilever spar of this cable-stay bridge, the Sundial Bridge at Turtle Bay, forms the gnomon of a large garden sundial The gnomon is the part of a sundial that casts the shadow. ... The hour (symbol: h) is a unit of time. ... Time zones are areas of the Earth that have adopted the same standard time, usually referred to as the local time. ... The most accurate timekeeping devices of the ancient world were the waterclock or clepsydra, one of which was found in the tomb of Egyptian pharaoh Amenhotep I (1525–1504 BC). They could be used to measure the hours even at night, but required manual timekeeping to replenish the flow of water. The Greeks and Chaldeans regularly maintained timekeeping records as an essential part of their astronomical observations. Arab engineers in particular made improvements on the use of waterclocks up to the Middle Ages.[11] A water clock or clepsydra is a device for measuring time by letting water regularly flow out of a container usually by a tiny aperture. ... Djeserkare Holy is the Soul of Re[1] Nomen Amenhotep Amun is Satisfied Horus name Kanaftau Bull who subdues the lands Nebty name Aaneru Who inspires great fear Golden Horus Uahrenput Enduring of years Consort(s) Ahmose-Meritamon Issue Amenemhat (died young), possibly Ahmes Father Ahmose I Mother Ahmose-Nefertari... Map showing the location of Tel Kaif, Iraq and the neighboring areas. ... A contemporary quartz watch The hourglass uses the flow of sand to measure the flow of time. They were used in navigation. Ferdinand Magellan used 18 glasses on each ship for his circumnavigation of the globe (1522).[12] Image File history File linksMetadata Size of this preview: 800 × 600 pixelsFull resolution (2848 × 2136 pixel, file size: 1. ... Image File history File linksMetadata Size of this preview: 800 × 600 pixelsFull resolution (2848 × 2136 pixel, file size: 1. ... A quartz clock. ... For other uses, see Hourglass (disambiguation). ... For the Presidential railcar named Ferdinand Magellan, see Ferdinand Magellan Railcar. ... Incense sticks and candles were, and are, commonly used to measure time in temples and churches across the globe. Waterclocks, and later, mechanical clocks, were used to mark the events of the abbeys and monasteries of the Middle Ages. Richard of Wallingford (1292–1336), abbot of St. Alban's abbey, famously built a mechanical clock as an astronomical orrery about 1330.[13][14] Richard of Wallingford (1292–1336) was an English mathematician active in the 14th century, who made major contributions to astronomy and horology whilst serving as the abbot of St Albans Abbey. ... For other uses, see Clock (disambiguation). ... A small orrery showing earth and the inner planets An orrery is a mechanical device that illustrates the relative positions and motions of the planets and moons in the solar system in heliocentric model. ... The English word clock probably comes from the Middle Dutch word "klocke" which is in turn derived from the mediaeval Latin word "clocca", which is ultimately derived from Celtic, and is cognate with French, Latin, and German words that mean bell. The passage of the hours at sea were marked by bells, and denoted the time (see ship's bells). The hours were marked by bells in the abbeys as well as at sea. For other uses, see Clock (disambiguation). ... A bell is a simple sound-making device. ... Ships bells are a system to indicate the hour by means of bells, used aboard a ship to regulate the sailors duty watches. ... A chip-scale atomic clock Clocks can range from watches, to more exotic varieties such as the Clock of the Long Now. They can be driven by a variety of means, including gravity, springs, and various forms of electrical power, and regulated by a variety of means such as a pendulum. Download high resolution version (1465x1449, 1419 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (1465x1449, 1419 KB) Wikipedia does not have an article with this exact name. ... For other uses, see Watch (disambiguation). ... The first prototype, on display at the Science Museum in London. ... For other uses, see Pendulum (disambiguation). ... A chronometer is a portable timekeeper that meets certain precision standards. Initially, the term was used to refer to the marine chronometer, a timepiece used to determine longitude by means of celestial navigation. More recently, the term has also been applied to the chronometer watch, a wristwatch that meets precision standards set by the Swiss agency COSC. A chronometer is a timekeeper precise enough to be used as a portable time standard, usually in order to determine longitude by means of celestial navigation. ... A marine chronometer is a timekeeper precise enough to be used as a portable time standard, used to determine longitude by means of celestial navigation. ... Longitude is the east-west geographic coordinate measurement most commonly utilized in cartography and global navigation. ... For the episode of The West Wing, see Celestial Navigation (The West Wing). ... A chronometer watch is a watch tested and certified to meet certain precision standards. ... This page is about timekeeping devices. ... COSC a/k/a C.O.S.C. is the Official Swiss Chronometer Testing Institute. ... The most accurate timekeeping devices are atomic clocks, which are accurate to seconds in many millions of years,[15] and are used to calibrate other clocks and timekeeping instruments. Atomic clocks use the spin property of atoms as their basis, and since 1967, the International System of Measurements bases its unit of time, the second, on the properties of caesium atoms. SI defines the second as 9,192,631,770 cycles of the radiation which corresponds to the transition between two electron spin energy levels of the ground state of the 133Cs atom. “Nuclear Clock” redirects here. ... General Name, Symbol, Number caesium, Cs, 55 Chemical series alkali metals Group, Period, Block 1, 6, s Appearance silvery gold Standard atomic weight 132. ... “SI” redirects here. ... Today, the Global Positioning System in coordination with the Network Time Protocol can be used to synchronize timekeeping systems across the globe. GPS redirects here. ... The Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer systems over packet-switched, variable-latency data networks. ... [edit] Definitions and standards Common units of time Unit Size Notes nanosecond 0.000 000 001 seconds microsecond 0.000 001 seconds millisecond 0.001 seconds second SI base unit minute 60 seconds hour 60 minutes day 24 hours week 7 days fortnight 14 days 2 weeks month 28 to 31 days quarter 3 months year 12 months common year 365 days 52 weeks + 1 day leap year 366 days 52 weeks + 2 days tropical year 365.24219 days average Gregorian year 365.2425 days average Olympiad 4 year cycle lustrum 5 years decade 10 years Indiction 15 year cycle generation 20 - 30 years approximate century 100 years millennium 1,000 years See also: Time standard and Orders of magnitude (time) The SI base unit for time is the SI second. From the second, larger units such as the minute, hour and day are defined, though they are "non-SI" units because they do not use the decimal system, and also because of the occasional need for a leap-second. They are, however, officially accepted for use with the International System. There are no fixed ratios between seconds and months or years as months and years have significant variations in length.[16] To help compare orders of magnitude of different times this page lists times between 10−9 seconds and 10−8 seconds (1 nanosecond and 10 nanoseconds) See also times of other orders of magnitude. ... To help compare orders of magnitude of different times this page lists times between 10−6 seconds and 10−5 seconds (1. ... One millisecond is one-thousandth of a second. ... This article is about the unit of time. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... A minute is a unit of time equal to 1/60th of an hour and to 60 seconds. ... The hour (symbol: h) is a unit of time. ... Look up day in Wiktionary, the free dictionary. ... For more details on each day of the week, see days of the week. ... Look up fortnight in Wiktionary, the free dictionary. ... Look up Month in Wiktionary, the free dictionary. ... A fiscal year (or financial year or accounting reference date) is a 12-month period used for calculating annual (yearly) financial statements in businesses and other organizations. ... A year (from Old English gÄ“r) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... A year (from Old English gÄ“r) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... For the 1921 film starring Fatty Arbuckle, see Leap Year (film). ... A tropical year is the length of time that the Sun, as viewed from the Earth, takes to return to the same position along the ecliptic (its path among the stars on the celestial sphere). ... For the calendar of religious holidays and periods, see liturgical year. ... An Olympiad is a period of four years, associated with the Olympic Games of Classical Greece. ... Lustrum was a sacrifice for expiation and purification offered by one of the censors of Rome in name of the Roman people at the close of the taking of the census, and which took place after a period of five years, so that the name came to denote a period... For other senses of this word, see decade (disambiguation). ... An indiction is any of the years in a 15-year cycle used to date medieval documents. ... // Traditionally, a generation has been defined as “the average interval of time between the birth of parents and the birth of their offspring. ... A century (From the Latin cent, one hundred) is one hundred consecutive years. ... A millennium (pl. ... A time scale specifies divisions of time. ... // The pages linked in the right-hand column contain lists of times that are of the same order of magnitude (power of ten). ... The SI system of units defines seven SI base units: physical units defined by an operational definition. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... This article is about the unit of time. ... A minute is a unit of time equal to 1/60th of an hour and to 60 seconds. ... The hour (symbol: h) is a unit of time. ... Look up day in Wiktionary, the free dictionary. ... A leap second is an intercalary, one-second adjustment that keeps broadcast standards for time of day close to mean solar time. ... Look up Month in Wiktionary, the free dictionary. ... A year (from Old English gÄ“r) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... The official SI definition of the second is as follows:[16][17] The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom. General Name, Symbol, Number caesium, Cs, 55 Chemical series alkali metals Group, Period, Block 1, 6, s Appearance silvery gold Standard atomic weight 132. ... At its 1997 meeting, the CIPM affirmed that this definition refers to a caesium atom in its ground state at a temperature of 0 K.[16] Previous to 1967, the second was defined as: the fraction 1/31,556,925.9747 of the tropical year for 1900 January 0 at 12 hours ephemeris time. A tropical year is the length of time that the Sun, as viewed from the Earth, takes to return to the same position along the ecliptic (its path among the stars on the celestial sphere). ... Ephemeris Time (ET) is a now obsolete time scale used in ephemerides of celestial bodies, in particular the Sun (as observed from the Earth), Moon, planets, and other members of the solar system. ... The current definition of the second, coupled with the current definition of the metre, is based on the special theory of relativity, which affirms our space-time to be a Minkowski space. This article is about the unit of length. ... Special relativity (SR) or the special theory of relativity is the physical theory published in 1905 by Albert Einstein. ... In special relativity and general relativity, time and three-dimensional space are treated together as a single four-dimensional pseudo-Riemannian manifold called spacetime. ... In physics and mathematics, Minkowski space (or Minkowski spacetime) is the mathematical setting in which Einsteins theory of special relativity is most conveniently formulated. ... [edit] World time The measurement of time is so critical to the functioning of modern societies that it is coordinated at an international level. The basis for scientific time is a continuous count of seconds based on atomic clocks around the world, known as the International Atomic Time (TAI). This is the yardstick for other time scales, including Coordinated Universal Time (UTC), which is the basis for civil time. “Nuclear Clock” redirects here. ... International Atomic Time (TAI, from the French name Temps Atomique International) is a high-precision atomic time standard that tracks proper time on Earths geoid. ... UTC redirects here. ... Earth is split up into a number of time zones. Most time zones are exactly one hour apart, and by convention compute their local time as an offset from UTC or Greenwich Mean Time. In many locations these offsets vary twice yearly due to daylight saving time transitions. Timezone and TimeZone redirect here. ... GMT redirects here. ... Although DST is common in Europe and North America, most of the worlds people do not use it. ... [edit] Sidereal time Sidereal time is the measurement of time relative to a distant star (instead of solar time that is relative to the sun). It is used in astronomy to predict when a star will be overhead. Due to the rotation of the earth around the sun a sidereal day is slightly less than a solar day. Sidereal time is time measured by the apparent diurnal motion of the vernal equinox, which is very close to, but not identical with, the motion of stars. ... [edit] Chronology Main article: Chronology Another form of time measurement consists of studying the past. Events in the past can be ordered in a sequence (creating a chronology), and be put into chronological groups (periodization). One of the most important systems of periodization is geologic time, which is a system of periodizing the events that shaped the Earth and its life. Chronology, periodization, and interpretation of the past are together known as the study of history. For the novel by Michael Crichton, see Timeline (novel). ... The past is the portion of the timeline that has already occurred; it is the opposite of the future. ... For the novel by Michael Crichton, see Timeline (novel). ... Periodization is the attempt to categorize or divide time into discrete named blocks. ... The table and timeline of geologic periods presented here is in accordance with the dates and nomenclature proposed by the International Commission on Stratigraphy. ... This article is about Earth as a planet. ... This article is about the study of the past in human terms. ... Allegorical woodcut of Time, who "revealeth all things", guiding his daughter Truth away from the demon of Hypocrisy. John Byddell, 1535. Image File history File links Size of this preview: 451 × 600 pixelsFull resolution (2000 × 2660 pixel, file size: 1. ... Image File history File links Size of this preview: 451 × 600 pixelsFull resolution (2000 × 2660 pixel, file size: 1. ... [edit] Time in religion and mythology Further information: Category:Time and fate deities Many ancient Greek philosophers, including Parmedides and Heraclitus, wrote essays on the nature of time.[18] One analogy compared the time of life to the passing of sand through an hourglass (a common measuring device for time in the past). The sand at the top is associated with the future, and, one tiny grain at a time, the future flows through the present into the past (associated with the sandpile at the bottom of hourglass). The past: ever expanding, the future: ever decreasing, but the future grains become amassed into the past through the present. The earliest recorded philosophy of time was expounded by Ptahhotep, who lived c. 2650–2600 BC. He said: "Do not lessen the time of following desire, for the wasting of time is an abomination to the spirit." Ptahhotep, sometimes known as Ptahhotpe or Ptah-Hotep, is the name of a 24th century BC vizier and philosopher. ... In the Old Testament book Ecclesiastes, thought to have been written by Solomon (970–928 BC), time (as the Hebrew word עדן, זמן `iddan(time) zĕman(season) is often translated) was traditionally regarded as a medium for the passage of predestined events. (Another word, זמן zman, was current as meaning time fit for an event, and is used as the modern Hebrew equivalent to the English word "time".) Topics in Christianity Movements · Denominations · Other religions Ecumenism · Preaching · Prayer Music · Liturgy · Calendar Symbols · Art · Criticism Important figures Apostle Paul · Church Fathers Constantine · Athanasius · Augustine Anselm · Aquinas · Palamas · Luther Calvin · Wesley Arius · Marcion of Sinope Archbishop of Canterbury · Catholic Pope Coptic Pope · Ecumenical Patriarch Christianity Portal This box:      Note: Judaism... Ecclesiastes, Qohelet in Hebrew, is a book of the Hebrew Bible. ... This article is about the Biblical jhhhhnn . ... Predestination (also linked with foreknowledge) is a religious concept, which involves the relationship between the beginning of things and their destinies. ... Hebrew redirects here. ... Hindu units of time shown logarithmically There is an appointed time (zman) for everything. And there is a time (’êth) for every event under heaven– A time (’êth) to give birth, and a time to die; A time to plant, and a time to uproot what is planted. A time to kill, and a time to heal; A time to tear down, and a time to build up. A time to weep, and a time to laugh; A time to mourn, and a time to dance. A time to throw stones, and a time to gather stones; A time to embrace, and a time to shun embracing. A time to search, and a time to give up as lost; A time to keep, and a time to throw away. A time to tear apart, and a time to sew together; A time to be silent, and a time to speak. A time to love, and a time to hate; A time for war, and a time for peace. – Ecclesiastes 3:1–8 Image File history File links HinduMeasurements. ... Image File history File links HinduMeasurements. ... Old Indian measures are still in use today, primarily for religious purposes in Hinduism and Jainism. ... A logarithmic scale is a scale of measurement that uses the logarithm of a physical quantity instead of the quantity itself. ... Ecclesiastes, Qohelet in Hebrew, is a book of the Hebrew Bible. ... [edit] Linear and cyclical time See also: Time Cycles and Wheel of time In general, the Judaeo-Christian concept, based on the Bible, is that time is linear, with a beginning, the act of creation by God. The Christian view assumes also an end, the eschaton, expected to happen when Christ returns to earth in the Second Coming to judge the living and the dead. This will be the consummation of the world and time. St Augustine's City of God was the first developed application of this concept to world history. The Christian view is that God is uncreated and eternal so that He and the supernatural world are outside time and exist in eternity. Time Cycles signify a 360 degree circular or eliptical rotation, orbit or journey in time typically of an object such as a planet or moon. ... Wheel of time may refer to: The Wheel of time or history, a religious concept predominant in Buddhism and Hinduism The Wheel of Time, a fantasy book series by author Robert Jordan The Wheel of Time (computer game), an action first-person shooter based on the series The Timewheel, a... Judeo-Christian tradition (also spelled Judaeo-Christian) is the body of concepts and values held in common by Christianity and Judaism. ... For other uses, see Bible (disambiguation). ... Creation is a doctrinal position in many religions which maintains that one or a group of gods or deities is responsible for creating the universe. ... This article is about the term God in the context of monotheism and henotheism. ... For other uses, see Christian (disambiguation). ... This page is about the title, office or what is known in Christian theology as the Divine Person. ... For other uses, see Second Coming (disambiguation). ... Augustinus redirects here. ... This article is about the work by St. ... While in the popular mind, eternity often simply means existing for an infinite, i. ... Ancient cultures such as Incan, Mayan, Hopi, and other Native American Tribes, plus the Babylonian, Ancient Greek, Hindu, Buddhist, Jainist, and others have a concept of a wheel of time, that regards time as cyclical and quantic consisting of repeating ages that happen to every being of the Universe between birth and extinction. For other meanings of Inca, see Inca (disambiguation). ... The adjective Mayan is sometimes used to refer to the indigenous peoples of parts of Mexico and Central America, their culture, language, and history. ... Moki redirects here. ... Babylonia was an ancient state in Iraq), combining the territories of Sumer and Akkad. ... Beginning of Homers Odyssey The Ancient Greek language is the historical stage of the Greek language[1] as it existed during the Archaic (9th–6th centuries BC) and Classical (5th–4th centuries BC) periods in Ancient Greece. ... This article discusses the adherents of Hinduism. ... A replica of an ancient statue found among the ruins of a temple at Sarnath Buddhism is a philosophy based on the teachings of the Buddha, Siddhārtha Gautama, a prince of the Shakyas, whose lifetime is traditionally given as 566 to 486 BCE. It had subsequently been accepted by... The hand with a wheel on the palm symbolizes the Jain Vow of Ahinsa, meaning non-injury and nonviolence. ... Wheel of time may refer to: The Wheel of time or history, a religious concept predominant in Buddhism and Hinduism The Wheel of Time, a fantasy book series by author Robert Jordan The Wheel of Time (computer game), an action first-person shooter based on the series The Timewheel, a... Social cycle theories are one of the earliest social theories in sociology. ... Quantic may refer to: Quantic is another name for the mathematical concept of algebraic forms. ... [edit] Time in philosophy Main article: Philosophy of space and time In Book 11 of St. Augustine's Confessions, he ruminates on the nature of time, asking, "What then is time? If no one asks me, I know: if I wish to explain it to one that asketh, I know not." He settles on time being defined more by what it is not than what it is.[19] Philosophy of space and time is the branch of philosophy concerned with the issues surrounding the ontology, epistemology, and character of space and time. ... St. ... The word Confessions has several meanings: Confessions is a series of books composed by St. ... Isaac Newton believed time and space form a container for events, which is as real as the objects it contains. Sir Isaac Newton FRS (4 January 1643 – 31 March 1727) [ OS: 25 December 1642 – 20 March 1727][1] was an English physicist, mathematician, astronomer, natural philosopher, and alchemist. ... This article is about the idea of space. ... In philosophy, an object is a thing, an entity, or a being. ... Absolute, true, and mathematical time, in and of itself and of its own nature, without reference to anything external, flows uniformly and by another name is called duration. Relative, apparent, and common time is any sensible and external measure (precise or imprecise) of duration by means of motion; such a measure – for example, an hour, a day, a month, a year – is commonly used instead of true time. – Principia[20] In contrast to Newton's belief in absolute space, and a precursor to Kantian time, Leibniz believed that time and space are relational.[21] The differences between Leibniz's and Newton's interpretations came to a head in the famous Leibniz-Clarke Correspondence. Leibniz thought of time as a fundamental part of an abstract conceptual framework, together with space and number, within which we sequence events, quantify their duration, and compare the motions of objects. In this view, time does not refer to any kind of entity that "flows," that objects "move through," or that is a "container" for events. Leibniz redirects here. ... Two giants of late-17th and early-18th Century philosophy, Clarke (left) and Leibniz (right) did battle between 1715 and 1716 over the very natures of space and time themselves The Leibniz-Clarke Correspondence is a collection of letters exchanged between Gottfried Leibniz and Samuel Clarke between 1715 and 1716... An abstract structure is a set of laws, properties and relationships that is defined independently of any physical objects. ... This article is about the idea of space. ... For other uses, see Number (disambiguation). ... Quantity is a kind of property which exists as magnitude or multitude. ... Immanuel Kant, in the Critique of Pure Reason, described time as an a priori intuition that allows us (together with the other a priori intuition, space) to comprehend sense experience.[22] With Kant, neither space nor time are conceived as substances, but rather both are elements of a systematic mental framework that necessarily structures the experiences of any rational agent, or observing subject. Spatial measurements are used to quantify how far apart objects are, and temporal measurements are used to quantify how far apart events occur. Kant redirects here. ... Title page of the 1781 edition. ... The terms a priori and a posteriori are used in philosophy to distinguish between two different types of propositional knowledge. ... This article is about the idea of space. ... Substance theory, or substance attribute theory, is an ontological theory about objecthood, positing that a substance is distinct from its properties. ... Look up Framework in Wiktionary, the free dictionary. ... Measurement is the estimation of the magnitude of some attribute of an object, such as its length or weight, relative to a unit of measurement. ... Quantity is a kind of property which exists as magnitude or multitude. ... In philosophy, an object is a thing, an entity, or a being. ... For other uses, see Phenomena (disambiguation). ... In Existentialism, time is considered fundamental to the question of being,[citation needed] in particular by the philosopher Martin Heidegger.[citation needed] See Ontology. Existentialism is a philosophical movement that posits that individuals create the meaning and essence of their lives, as opposed to deities or authorities creating it for them. ... In ontology, a being is anything that can be said to be, either transcendantly or immanently. ... Martin Heidegger (September 26, 1889 – May 26, 1976) (IPA ) was a highly influential German philosopher. ... This article is about ontology in philosophy. ... Henri Bergson believed that time was neither a real homogeneous medium nor a mental construct, but possesses what he referred to as Duration. Duration, in Bergson's view, was creativity and memory as an essential component of reality.[23] Henri-Louis Bergson (October 18, 1859–January 4, 1941) was a major French philosopher, influential in the first half of the 20th century. ... [edit] Time as "unreal" In 5th century BC Greece, Antiphon the Sophist, in a fragment preserved from his chief work On Truth held that: "Time is not a reality (hypostasis), but a concept (noêma) or a measure (metron)." Parmenides went further, maintaining that time, motion, and change were illusions, leading to the paradoxes of his follower Zeno.[24] Time as illusion is also a common theme in Buddhist thought,[25] and some modern philosophers have carried on with this theme. J. M. E. McTaggart's 1908 The Unreality of Time, for example, argues that time is unreal (see also The flow of time). To meet Wikipedias quality standards, this article or section may require cleanup. ... Sophism was originally a term for the techniques taught by a highly respected group of philosophy and rhetoric teachers in ancient Greece. ... Parmenides of Elea (Greek: , early 5th century BC) was an ancient Greek philosopher born in Elea, a Hellenic city on the southern coast of Italy. ... “Arrow paradox” redirects here. ... Zeno of Elea (IPA:zÉ›noÊŠ, É›lɛɑː)(circa 490 BC? – circa 430 BC?) was a pre-Socratic Greek philosopher of southern Italy and a member of the Eleatic School founded by Parmenides. ... A replica of an ancient statue found among the ruins of a temple at Sarnath Buddhism is a philosophy based on the teachings of the Buddha, Siddhārtha Gautama, a prince of the Shakyas, whose lifetime is traditionally given as 566 to 486 BCE. It had subsequently been accepted by... John McTaggart Ellis McTaggart (1866-1925) was the leading Hegel scholar in England at the beginning of the 20th Century, and friend and teacher of Bertrand Russell and G. E. Moore. ... Wikisource has original text related to this article: The Unreality of Time To meet Wikipedias quality standards, this article or section may require cleanup. ... Philosophy of space and time is the branch of philosophy concerned with the issues surrounding the ontology, epistemology, and character of space and time. ... However, these arguments often center around what it means for something to be "real". Modern physicists generally consider time to be as "real" as space, though others such as Julian Barbour in his The End of Time argue that quantum equations of the universe take their true form when expressed in the timeless configuration spacerealm containing every possible "Now" or momentary configuration of the universe, which he terms 'platonia'.[26] (See also: Eternalism (philosophy of time).) Julian Barbour (born 1937) is a British physicist. ... The End of Time: The Next Revolution in Physics is a book by Julian Barbour published in 1999 that denies time exists as anything but an illusion. ... In mathematics, a function space is a set of functions of a given kind from a set X to a set Y. It is called a space because in most applications, it is a topological space or/and a vector space. ... Eternalism is a philosophical approach to the ontological nature of time. ... [edit] Time in the physical sciences Main article: Time in physics From the age of Newton up until Einstein's profound reinterpretation of the physical concepts associated with time and space, time was considered to be "absolute" and to flow "equably" (to use the words of Newton) for all observers.[27] The science of classical mechanics is based on this Newtonian idea of time. To meet Wikipedias quality standards, this article or section may require cleanup. ... Sir Isaac Newton FRS (4 January 1643 – 31 March 1727) [ OS: 25 December 1642 – 20 March 1727][1] was an English physicist, mathematician, astronomer, natural philosopher, and alchemist. ... “Einstein” redirects here. ... Einstein, in his special theory of relativity,[28] postulated the constancy and finiteness of the speed of light for all observers. He showed that this postulate, together with a reasonable definition for what it means for two events to be simultaneous, requires that distances appear compressed and time intervals appear lengthened for events associated with objects in motion relative to an inertial observer. For a less technical and generally accessible introduction to the topic, see Introduction to special relativity. ... Einstein showed that if time and space is measured using electromagnetic phenomena (like light bouncing between mirrors) then due to the constancy of the speed of light, time and space become mathematically entangled together in a certain way (called Minkowski space) which in turn results in Lorentz transformation and in entanglement of all other important derivative physical quantities (like energy, momentum, mass, force, etc) in a certain 4-vectorial way (see special relativity for more details). Einstein redirects here. ... In physics and mathematics, Minkowski space (or Minkowski spacetime) is the mathematical setting in which Einsteins theory of special relativity is most conveniently formulated. ... This article is about the idea of space. ... In physics, the Lorentz transformation converts between two different observers measurements of space and time, where one observer is in constant motion with respect to the other. ... For a less technical and generally accessible introduction to the topic, see Introduction to special relativity. ... Classical mechanics Newton's Second Law History of ... Fundamental concepts Space · Time · Mass · Force Energy · Momentum Formulations Newtonian mechanics Lagrangian mechanics