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 , often depicted in star trail photography.
12-484: [REDACTED] Look up diurnal in Wiktionary, the free dictionary. Diurnal (" daily ") may refer to: General [ edit ] Diurnal cycle , any pattern that recurs daily Diurnality , the behavior of animals and plants that are active in the daytime Diurnal phase shift , a phase shift of electromagnetic signals Diurnal temperature variation ,
24-604: A sect for which the Sun is above the horizon See also [ edit ] Diurnality Salisbury Diurnal Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Diurnal . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Diurnal&oldid=1242930963 " Category : Disambiguation pages Hidden categories: Short description
36-401: A chart for a given date, based on the natal chart Diurnal planet, a planet in a sect for which the Sun is above the horizon See also [ edit ] Diurnality Salisbury Diurnal Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Diurnal . If an internal link led you here, you may wish to change
48-468: A cycle of daily temperature change Astronomy [ edit ] Diurnal arc , the time (expressed in right ascension) that it takes a planet etc. to move from its rising to its setting point Diurnal motion , the apparent motion of stars around the Earth Astrology [ edit ] Diurnal chart, a chart for a given date, based on the natal chart Diurnal planet, a planet in
60-426: Is different from Wikidata All article disambiguation pages All disambiguation pages diurnal [REDACTED] Look up diurnal in Wiktionary, the free dictionary. Diurnal (" daily ") may refer to: General [ edit ] Diurnal cycle , any pattern that recurs daily Diurnality , the behavior of animals and plants that are active in
72-430: The angular diameter of one of the following objects: Star trail and time-lapse photography capture diurnal motion blur . The apparent motion of stars near the celestial pole seems slower than that of stars closer to the celestial equator. Conversely, following the diurnal motion with the camera to eliminate its arcing effect on a long exposure , can best be done with an equatorial mount , which requires adjusting
84-429: The celestial sphere , including the possible part below the horizon, has a length proportional to the cosine of the declination . Thus, the speed of the diurnal motion of a celestial object equals this cosine times 15° per hour, 15 arcminutes per minute, or 15 arcseconds per second. Per a certain period of time, a given angular distance travelled by an object along or near the celestial equator may be compared to
96-436: The daytime Diurnal phase shift , a phase shift of electromagnetic signals Diurnal temperature variation , a cycle of daily temperature change Astronomy [ edit ] Diurnal arc , the time (expressed in right ascension) that it takes a planet etc. to move from its rising to its setting point Diurnal motion , the apparent motion of stars around the Earth Astrology [ edit ] Diurnal chart,
108-512: The link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Diurnal&oldid=1242930963 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Diurnal motion 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
120-461: The north pole star . At the North Pole , the cardinal directions do not apply to diurnal motion. Within the circumpolar circle, all the stars move simply rightward, or looking directly overhead, counterclockwise around the zenith , where Polaris is. Southern Celestial Hemisphere observers are to replace north with south, left with right, and Polaris with Sigma Octantis , sometimes called
132-484: The south pole star. The circumpolar stars move clockwise around Sigma Octantis. East and west are not interchanged. As seen from the Equator , the two celestial poles are on the horizon due north and south, and the motion is counterclockwise (i.e. leftward) around Polaris and clockwise (i.e. rightward) around Sigma Octantis. All motion is westward, except for the two fixed points. The daily arc path of an object on
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#1732800843725144-582: 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. The relative direction of diurnal motion in the Northern Celestial Hemisphere are as follows: Thus, northern circumpolar stars move counter clockwise around Polaris ,
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