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As an alternative to using a clock to describe the rotation of a body, it is possible to use the right/left hand rule to determine the rotation. The thumb shall point in the normal direction of the surface in question and the four remaining fingers in the direction of the rotation of the surface. The
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moves in the sky (from east to south to west), the shadow, which is cast on the sundial in the opposite direction, moves with the same sense of rotation (from west to north to east). This is why hours must be drawn in horizontal sundials in that manner, and why modern clocks have their numbers set in
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To apply the right-hand rule, place one's loosely clenched right hand above the object with the thumb pointing in the direction one wants the screw, nut, bolt, or cap ultimately to move, and the curl of the fingers, from the palm to the tips, will indicate in which way one needs to turn the screw,
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the post), the movement of the sun is from right to top to left, and, accordingly, the shadow moves from left to down to right, i.e., counterclockwise. This effect is caused by the plane of the dial having been rotated through the plane of the motion of the sun and thus the shadow is observed from
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rotation in
Western Countries and Latin America and there is typically resistance to playing counterclockwise. Traditionally, and for the most part today, turns pass counterclockwise in many Asian countries. In Western countries, when speaking and discussion activities take place in a circle, the
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Sometimes the opposite (left-handed, counterclockwise, reverse) sense of threading is used for a special reason. A thread might need to be left-handed to prevent operational stresses from loosening it. For example, some older
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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
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position of the speaker tends to move clockwise, even though there is no requirement that it do so. Curiously, unlike with games, there is usually no objection if turns begin to move counterclockwise.
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has right-handed threads on one end and left-handed threads on the other. Some gas fittings are left-handed to prevent disastrous misconnections: oxygen fittings are right-handed, but
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the other side of the dial's plane and is observed as moving in the opposite direction. Some clocks were constructed to mimic this. The best-known surviving example is the
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on the right wheels and left-handed lug nuts on the left wheels, so that, as the vehicle moved forward, the lug nuts tended to tighten rather than loosen. For
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282:), and they were made to work like horizontal sundials. In order for such a sundial to work north of the equator during spring and summer, and north of the
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headings increase clockwise around the compass face, starting with 0° at the top of the compass (the northerly direction), with 90° to the right (east).
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nut, bolt or cap to achieve the desired result. Almost all threaded objects obey this rule except for a few left-handed exceptions described below.
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173:'s hands relative to the observer: from the top to the right, then down and then to the left, and back up to the top. The opposite sense of
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the same way, and their hands moving accordingly. For a vertical sundial (such as those placed on the walls of buildings, the dial being
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the whole year, the noon-mark of the dial must be placed northward of the pole casting the shadow. Then, when the
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499:. An alternative formulation with sin and cos swapped gives a clockwise trace from the upper-most point, where
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of the arm, which is used by a right-handed person to tighten a screw clockwise, is generally stronger than
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In general, most card games, board games, parlor games, and multiple team sports play in a clockwise
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pointing directly to the right (or east), and 90° pointing straight up (or north). However, in
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Occasionally, clocks whose hands revolve counterclockwise are sold as a novelty. One historic
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Clocks traditionally follow this sense of rotation because of the clock's predecessor: the
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language and from the same root as the Latin "dexter" ("right") were used for clockwise. "
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The shadow of a horizontal sundial in the
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The reason for the clockwise standard for most screws and bolts is that
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Viewed from the north, Earth rotates anticlockwise or counterclockwise
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can have similarly defined senses when considering the corresponding
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are conventionally measured counterclockwise, starting with 0° or 0
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245:"weddersinnes", "opposite course") was used for counterclockwise.
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601:"COUNTERCLOCKWISE | meaning in the Cambridge English Dictionary"
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can occur in two possible directions or senses of rotation.
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Notably, the game of baseball is played counterclockwise.
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This article is about the direction. For other uses, see
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in the 18th century, using right-to-left reading in the
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Movement in the same direction as the hands of a clock
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uses a left-hand thread to keep it from loosening. A
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Conventional direction of the axis of a rotating body
233:" and "deasil", "deiseil" and even "deocil" from the
56:. Unsourced material may be challenged and removed.
257:, and counterclockwise when viewed from above the
492:increases in value, from the right-most point at
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535:resulting direction of the rotation is thereby
151:The counterclockwise or anticlockwise direction
659:Sam Jones and Sara Shahriari (June 25, 2014).
503:can be considered akin to a compass heading.
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229:Before clocks were commonplace, the terms "
116:Learn how and when to remove this message
539:Normal right rotation = counterclockwise
488:is traced counterclockwise as the angle
253:is clockwise when viewed from above the
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530:Alternative, normal right/left rotation
630:"Definition of widdershins in English"
169:) proceeds in the same direction as a
464:A circle defined parametrically in a
300:, whose hands move counterclockwise.
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54:adding citations to reliable sources
671:from the original on June 25, 2014
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542:Normal left rotation = clockwise
307:clock was built that way in the
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611:from the original on 2015-10-04
41:needs additional citations for
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395:and trucks had right-handed
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309:Jewish Town Hall in Prague
298:Münster astronomical clock
207:Three-dimensional rotation
21:Clockwise (disambiguation)
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241:" or "withershins" (from
605:dictionary.cambridge.org
466:positive Cartesian plane
159:Two-dimensional rotation
567:Inner/outer orientation
211:angular velocity vector
139:The clockwise direction
701:Orientation (geometry)
634:OxfordDictionaries.com
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562:Chirality (chemistry)
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165:motion (abbreviated
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696:Concepts in physics
558:Chirality (physics)
582:Relative direction
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445:in general, plane
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577:Retrograde motion
572:Optical isomerism
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673:. Retrieved
665:The Guardian
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48:Please help
43:verification
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443:mathematics
427:Mathematics
405:flyer whorl
358:bottle caps
321:Evo Morales
239:Widdershins
217:Terminology
65:"Clockwise"
690:Categories
615:2020-06-26
588:References
553:Handedness
455:navigation
413:turnbuckle
381:supination
319:president
259:North Pole
255:South Pole
179:revolution
106:March 2019
76:newspapers
417:acetylene
385:pronation
340:Shop-work
193:) or (in
163:Clockwise
675:June 26,
669:Archived
609:Archived
547:See also
397:lug nuts
344:Typical
317:Bolivian
175:rotation
644:4 March
459:compass
451:radians
421:propane
274:sundial
231:sunwise
181:is (in
90:scholar
483:= sin
473:= cos
447:angles
350:screws
329:La Paz
305:Jewish
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407:of a
354:bolts
335:Usage
293:below
279:Clock
251:Earth
171:clock
97:JSTOR
83:books
677:2014
646:2019
513:turn
478:and
441:and
393:cars
346:nuts
69:news
497:= 0
437:In
288:Sun
205:).
203:CCW
191:ACW
177:or
52:by
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