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Diurnal motion (from Latin diurnus 'daily', from Latin diēs 'day') is an astronomical term referring to the apparent motion of celestial objects (e.g. the Sun and stars) around Earth, or more precisely around the two celestial poles, over the course of one day. It is caused by Earth's rotation around its axis, so almost every star appears to follow a circular arc path, called the diurnal circle,[1] often depicted in star trail photography.
The time for one complete rotation is 23 hours, 56 minutes, and 4.09 seconds – one sidereal day. The first experimental demonstration of this motion was conducted by Léon Foucault. Because Earth orbits the Sun once a year, the sidereal time at any given place and time will gain about four minutes against local civil time, every 24 hours, until, after a year has passed, one additional sidereal "day" has elapsed compared to the number of solar days that have gone by.
Diurnalmotion (from Latin diurnus 'daily', from Latin diēs 'day') is an astronomical term referring to the apparent motion of celestial objects (e.g...
along which the Sun appears to follow on the celestial sphere in its diurnalmotion. The longer arc is always the midsummer path while the shorter arc the...
Because the start and end times for prayers are related to the solar diurnalmotion, they vary throughout the year and depend on the local latitude and...
Motion blur is the apparent streaking of moving objects in a photograph or a sequence of frames, such as a film or animation. It results when the image...
instrument attached to it to stay fixed on any celestial object with diurnalmotion by driving one axis at a constant speed. Such an arrangement is called...
circular path called the ecliptic. Earth's rotation about its axis causes diurnalmotion, so that the Sun appears to move across the sky in a Sun path that depends...
around the Sun Diurnalmotion, the apparent motion of objects in the sky due to the Earth's rotation on its axis Parallax, the apparent motion of objects...
than the number of solar days. Solar time is measured by the apparent diurnalmotion of the Sun. Local noon in apparent solar time is the moment when the...
which directly tracks the diurnalmotion of the Sun, and mean solar time, which tracks a theoretical mean Sun with uniform motion along the celestial equator...
UT0 is Universal Time determined at an observatory by observing the diurnalmotion of stars or extragalactic radio sources, and also from ranging observations...
Primum Mobile, so called because it reproduces the diurnalmotion of the stars and the annual motion of the sun against the background of stars. Each of...
known as a Haig or Scotch mount, is a device used to cancel out the diurnalmotion of the Earth for the observation or photography of astronomical objects...
determination of the mean and true planets, three problems pertaining to diurnalmotion of Earth, eclipses, rising and setting of the planets, the various cusps...
setting. However, all objects on the celestial sphere are subject to diurnalmotion, which always appears to be westward. A northern observer can determine...
axis, at a constant rate, to follow the rotation of the night sky (diurnalmotion). Altazimuth mounts need to be rotated about both axes at variable rates...
Columbus inaccurately measured the polar radius of the North Star's diurnalmotion to be five degrees, double the value of another erroneous reading he...
Because the start and end times for prayers are related to the solar diurnalmotion, they vary throughout the year and depend on the local latitude and...
gravity Apogeotropism: negative geotropism Heliotropism: the diurnalmotion or seasonal motion of plant parts in response to the direction of the Sun, (e...
diurnalmotion gear-ring and rotates the Component of the Three Arrangers of Time, thus following the motion of the heavens. In addition, the motion gear...
the celestial poles. (This daily cycle of apparent movement is called diurnalmotion.) All the stars seem fixed on a celestial sphere surrounding the observer...
Many shorelines experience semi-diurnal tides—two nearly equal high and low tides each day. Other locations have a diurnal tide—one high and low tide each...
(mineral), a variety of jasper or chalcedony Heliotropism, plants' diurnalmotion in response to the sun's movement Heliotrope, a story collection by...
Christopher Columbus, based on his incorrect readings of the North Star's diurnalmotion. John A. O'Keefe and co-authors are credited with the discovery that...
Earth are seen to proceed from east to west daily, due to the Earth's diurnalmotion, and yearly, due to the Earth's revolution around the Sun. At the same...
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