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An ephemeris (plural: ephemerides) (from the Greek word ephemeros = daily) is a device giving the positions of astronomical objects in the sky. Different kinds are used for astronomy and astrology. Even today an ephemeris will often be a simple printed table; however this was also one of the first applications of mechanical computers. See lists of astronomical objects for a list of the various lists of astronomical objects in Wikipedia. ...
When seen from altitude, as here from an airplane, the skys color varies from pale to dark at elevations approaching the zenith Turbulent skies The skys zenith appears centered in this daytime photograph taken looking up though trees Clouds made orange by a sunset The sky is the...
A giant Hubble mosaic of the Crab Nebula, a supernova remnant Astronomy (also frequently referred to as astrophysics) is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earths atmosphere (such as the cosmic background radiation). ...
Hand-coloured version of the anonymous Flammarion woodcut (1888). ...
The history of computing is longer than the history of computing hardware and modern computing technology and includes the history of methods intended for pen and paper or for chalk and slate, with or without the aid of tables. ...
The position is given to astronomers in a Spherical polar coordinate system of right ascension and declination or to astrologer in longitude along the zodiacal ecliptic. Astrological positions may be given for either noon or midnight. A polar grid with several angles labeled in degrees In mathematics, the polar coordinate system is a two-dimensional coordinate system in which each point on a plane is determined by an angle and a distance. ...
Equatorial Coordinates Right ascension (abbrev. ...
In astronomy, declination (abbrev. ...
An astrologer practices one or more forms of astrology. ...
Longitude is the east-west geographic coordinate measurement most commonly utilized in cartography and global navigation. ...
The term zodiac denotes an annual cycle of twelve stations along the ecliptic, the apparent path of the sun across the heavens through constellations that divide the ecliptic into twelve equal zones of celestial longitude. ...
The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ...
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. ...
For other uses, see Midnight (disambiguation) Midnight, literally the middle of the night, is a time arbitrarily designated to determine the end of a day and the beginning of the next in some, mainly Western, cultures. ...
An ephemeris may also provide data on astronomical phenomena of interest to astrologers and astronomers such as eclipses, apparent retrogradation/planetary stations, planetary ingresses, sidereal time, positions for the Mean and True nodes of the moon, the phases of the Moon, and sometimes even the position(s) of Chiron, Lilith, and other minor or imaginary celestial bodies. Some ephemerides also contain a monthly aspectarian, while others often include the declination of the planets as well as their longitudes, right ascensions or Cartesian coordinates. A giant Hubble mosaic of the Crab Nebula, a supernova remnant Astronomy (also frequently referred to as astrophysics) is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earths atmosphere (such as the cosmic background radiation). ...
An astrologer practices one or more forms of astrology. ...
An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ...
This article is about astronomical eclipses. ...
Prograde motion is the rotational or orbital motion of a body in a direction similar to that of other bodies within a given system, and is sometimes called direct motion. ...
Planetary is an adjective meaning relating to a planet or planets. ...
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. ...
The lunar nodes are the orbital nodes of the Moon, that is, the points where the orbit of the Moon crosses the ecliptic (which is the apparent path of the Sun across the heavens against the background stars). ...
In astronomy, a phase of the Moon is any of the aspects or appearances presented by the Moon as seen from Earth, determined by the portion of the Moon that is visibly illuminated by the Sun. ...
2060 Chiron (IPA: ) is an object in the outer solar system with an orbit between those of Saturn and Uranus and a radius of 71±5 km [1]. Although it was initially classified as an asteroid, later dispute arose as to whether it was an asteroid or actually a comet. ...
To meet Wikipedias quality standards, this article may require cleanup. ...
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In astrology, an aspect is the relative angle between two heavenly bodies. ...
In astronomy, declination (abbrev. ...
Equatorial Coordinates Right ascension (abbrev. ...
Cartesian means relating to the French mathematician and philosopher Descartes, who, among other things, worked to merge algebra and Euclidean geometry. ...
History
In 1554, Johannes Stadius published a well-known work known as Ephemerides novae at auctae that attempted to give accurate planetary positions. The effort was not entirely successful, and there were, for example, periodic errors in Stadius’ Mercury positions of up to ten degrees. Events January 5 - Great fire in Eindhoven, Netherlands. ...
For the crater, see Stadius (crater). ...
Scientific ephemeris For scientific uses, a modern planetary ephemeris comprises software that generates positions of the planets and often of their satellites, or of asteroids or comets at virtually any time desired by the user. Often there is an option to find the velocities of the bodies of interest, as well. 253 Mathilde, a C-type asteroid. ...
Comet Hale-Bopp Comet West For other uses, see Comet (disambiguation). ...
Typically, such ephemerides cover several centuries, past and future; the future ones can be covered because celestial mechanics is an accurate theory. Nevertheless, there are secular phenomena, factors that cannot adequately be considered by ephemerides. The biggest uncertainties on planetary positions are due to the perturbations of numerous asteroids, most of whose masses are poorly known, rendering their effect uncertain. Therefore, despite efforts to overcome these uncertainties, the JPL has to revise its published ephemerides at intervals of 20 years. Celestial mechanics is a division of astronomy dealing with the motions and gravitational effects of celestial objects. ...
In astronomy, secular phenomena (which repeat too slowly to be observed, if at all) are contrasted with phenomena observed to repeat periodically. ...
Asteroids is a popular vector-based video arcade game released in 1979 by Atari. ...
The JPL complex in Pasadena, Ca. ...
Solar system ephemerides are essential for the navigation of spacecraft and for all kinds of space observations of the planets, their natural satellites, stars and galaxies. Major features of the Solar System (not to scale; from left to right): Pluto, Neptune, Uranus, Saturn, Jupiter, the asteroid belt, the Sun, Mercury, Venus, Earth and its Moon, and Mars. ...
The Space Shuttle Discovery as seen from the International Space Station. ...
A planet (from the Greek πλανήτης, planetes or wanderers) is a body of considerable mass that orbits a star and that produces very little or no energy through nuclear fusion. ...
A natural satellite is an object that orbits a planet or other body larger than itself and which is not man-made. ...
STAR is an acronym for: Organizations Society of Ticket Agents and Retailers], the self-regulatory body for the entertainment ticket industry in the UK. Society for Telescopy, Astronomy, and Radio, a non-profit New Jersey astronomy club. ...
This article is about a celestial body. ...
Scientific ephemerides for sky observers mostly contain the position of the mentioned celestial body in right ascension and declination, because these coordinates are the most often used on star maps and telescopes. The equinox of the coordinate system must be given. It is in nearly all cases either the actual equinox (the equinox valid for that moment, often referred to as "of date" or "current"), or that of the one of the "standard" equinoxes, typically J2000.0, B1950.0, or J1900. Star maps are almost always in one of the standard equinoxes. Equatorial Coordinates Right ascension (abbrev. ...
In astronomy, declination (abbrev. ...
Illumination of the Earth by the Sun on the day of equinox, (ignoring twilight). ...
It has been suggested that this article or section be merged into Julian epoch. ...
The B1950. ...
Scientific ephemerides often contain further useful data about the moon, planet, asteroid, or comet beyond the pure coordinates in the sky, such as elongation to the sun, brightness, distance, velocity, apparent diameter in the sky, phase angle, times of rise, transit, and set, etc. Ephemerides of the planet Saturn also sometimes contain the apparent inclination of its ring. Adjectives: Saturnian Atmosphere [3] Scale height: 59. ...
An ephemeris is usually only correct for a particular location on the Earth. In many cases the differences are too small to matter, but for nearby asteroids or the Moon they can be quite important. Asteroids is a popular vector-based video arcade game released in 1979 by Atari. ...
This article is about Earths moon. ...
Astrological ephemeris Astrologers pay attention to different data than scientists. In particular they are concerned with the motion of planets along the ecliptic and through constellations (though not all astrologers use the constellations), along with when planets appear to become stationary due to relative motion with the earth around the sun. The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ...
This article does not cite any references or sources. ...
Though astrology is and always has been geocentric, heliocentric astrology is an emerging field; for this purpose a standard ephemeris cannot be utilized, and because of this specialized heliocentric ephemerides must be calculated and used instead of the default geocentric ephemerides that are used in standard Western astrology to construct the astrological chart/natal chart. Hand-coloured version of the anonymous Flammarion woodcut (1888). ...
The geocentric model (in Greek: geo = earth and centron = centre) of the universe is a paradigm which places the Earth at its center. ...
In astronomy, heliocentrism is the theory that the Sun is at the center of the Universe and/or the Solar System. ...
Western astrology is the system of astrology most popular in Western countries. ...
This article does not cite any references or sources. ...
This natal chart, appearing in Ebenezer Siblys Astrology (1806), was drawn for the speculated birth date of Jesus Christ, midnight, December 25, year 45 in the Julian calendar. ...
References - Montenbruck, Oliver (1989). Practical Ephemeris Calculations. Springer-Verlag. ISBN 0-387-50704-3.
- Meeus, Jean (1991). Astronomical Algorithms. Willmann-Bell. ISBN 0-943396-35-2.
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