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A clockwise motion is one that proceeds 'like the clock's hands': from the top to the right, then down and then to the left, and back to the top. In a mathematical sense, a circle defined parametrically in a positive Cartesian plane by the equations x = sin t and y = cos t is traced clockwise as t increases in value. Another way to describe this motion is, relative to above you, clockwise is the motion you make when you constantly turn right. The opposite sense of rotation is counterclockwise (now chiefly North American English), or anticlockwise (the current British English term). Image File history File links No higher resolution available. ...
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A wrist watch A clock (from the Latin cloca, bell) is an instrument for measuring time. ...
Fig. ...
North American English is a collective term used for the varieties of the English language that are spoken in the United States and Canada. ...
British English (BrE) is a broad term used to distinguish the forms of the English language used in the United Kingdom from forms used elsewhere. ...
Origin of the term
Before clocks were commonplace, the terms 'sunwise' and deiseil (from the Scottish Gaelic from the same root as the Latin dexter, "right". The word is also used for "ready") were used for clockwise. (Of course, deasil (righthandwards) is only sunwise in the Northern Hemisphere.) 'Widdershins' or 'withershins' (from Middle Low German weddersinnes, "opposite course") was used for counterclockwise. // Scottish Gaelic (GÃ idhlig) is a member of the Goidelic branch of Celtic languages. ...
The Northern Hemisphere is the half of a planets surface (or celestial sphere) that is north of the equator (the word hemisphere literally means half ball). On the Earth, the Northern Hemisphere contains most of the land and about 88-90% of the human population. ...
This page is a candidate to be copied to Wiktionary. ...
The Middle Low German language is an ancestor of the modern Low German language, and was spoken from about 1100 to 1500. ...
 The Counterclockwise or Anticlockwise direction Technically, the terms clockwise and counterclockwise can only be applied to a rotational motion once a side of the rotational plane is specified, from which the rotation is observed. For example, the daily rotation of the Earth is counterclockwise when viewed from the North Pole, and clockwise when viewed from the South Pole. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ...
For other uses, see North Pole (disambiguation). ...
Amundsen-Scott South Pole Station. ...
Clocks traditionally follow this sense of rotation because of the clock's predecessor: the sundial. Clocks with hands were first built in the Northern Hemisphere (see main article), and they were made to work like sundials. In order for a horizontal sundial to work (in the north), it must be placed looking southward. Then, when the Sun moves in the sky (east to south to west), the shadow cast by the sundial moves in the opposite direction, that is west to north to east. That's why hours were drawn in sundials in that manner, and that's why modern clocks have their numbers set in the same way. Wall sundial-a vertical direct south dial Wall sundial in Warsaws Old Town- a vertical south west decliner dial A sundial is a device that measures time by the position of the Sun. ...
A wrist watch A clock (from the Latin cloca, bell) is an instrument for measuring time. ...
The Sun is the star at the center of the Solar System. ...
Occasionally, clocks whose hands revolve counterclockwise are nowadays sold as a novelty. Historically, some Jewish clocks were built that way, for example in some Synagogue towers in Europe. This was done in accordance with the right-to-left reading direction of Hebrew [1]. This article or section does not cite its references or sources. ...
“Hebrew†redirects here. ...
Usage Typically, screws, bolts, and bottle caps are loosened (moved towards the observer) counterclockwise and tightened (moved away from the observer) clockwise, in accordance with the right-hand rule. One mnemonic for remembering this is "righty-tighty, lefty-loosey" (right to tighten, left to loosen.)(R H Daniel, 1980) The problem with the mnemonic is that it only works when viewing right and left relative to the top of the circle. When viewing relative to the bottom, the mnemonic becomes "lefty-tighty, righty-loosy". Another simple to use procedure based on the right-hand rule, is to point the thumb of the right hand for right-handed threads or left hand for left-handed threads in the direction one wants the screw, nut or bolt to move, then the fingers of the hand will curl in the direction one needs to turn the screw, nut or bolt to achieve the desired result. Screws come in a variety of shapes and sizes for different purposes. ...
Screws come in a variety of shapes and sizes for different purposes. ...
A crown cap from a Heineken beer bottle Pull-off bottle cap The plastic cap and top of a sports water bottle. ...
The left-handed orientation is shown on the left, and the right-handed on the right. ...
Wikiquote has a collection of quotations related to: English mnemonics A mnemonic (pronounced in RP, [nɪmɑnɪk] in GA) is a memory aid, and most serve an educational purpose. ...
The reason for the clockwise orientation of most screws is that supination of the arm, which is used by a right-handed person to turn a screw clockwise, is generally stronger than pronation. In human and zoological anatomy (sometimes called zootomy), several terms are used to describe the location of organs and other structures in the body of bilateral animals. ...
In human and zoological anatomy (sometimes called zootomy), several terms are used to describe the location of organs and other structures in the body of bilateral animals. ...
Sometimes the opposite sense of thread is used for a special reason; a thread might need to be left-handed to prevent the prevalent stresses from loosening it. In a pair of bicycle pedals, for instance, one must be reverse-threaded, or the pedal will fall off. Some gas fittings are left-handed to prevent disastrous misconnection; for example, oxygen fittings are right-handed but acetylene and other flammable gases use left-handed fittings. A bicycle pedal provides the connection between the cyclists foot or shoe and the crankarm allowing the leg to be used to turn the crank. ...
In trigonometry, and mathematics in general, plane angles are conventionally measured counterclockwise. In navigation, compass headings increase in a clockwise direction around the compass card, starting with 0° at the top of the card. Wikibooks has a book on the topic of Trigonometry Trigonometry (from the Greek Trigona = three angles and metron = measure[1]) is a branch of mathematics which deals with triangles, particularly triangles in a plane where one angle of the triangle is 90 degrees (right angled triangles). ...
Euclid, Greek mathematician, 3rd century BC, as imagined by by Raphael in this detail from The School of Athens. ...
An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. ...
Table of geography, hydrography, and navigation, from the 1728 Cyclopaedia. ...
Compass in a wooden box A compass (or mariners compass) is a navigational instrument for finding directions on the earth. ...
In humans Most left-handed humans prefer to draw circles clockwise and traverse buildings clockwise. This is thought to have come about due to a dominant brain hemisphere. [2]
References - ^ http://www.scrapbookpages.com/CzechRepublic/Prague/Josefov/JosefovHistory.html.
- ^ Theodore H. Blau, The torque test: A measurement of cerebral dominance. 1974, American Psychological Association.
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