sidereal day
sidereal day
sidereal day
side′real day′
n.
sidereal day
Noun | 1. | sidereal day - the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day |
单词 | sidereal day | |||
释义 | sidereal daysidereal daysidereal dayside′real day′n. sidereal day
sidereal daysidereal day:see sidereal timesidereal time(ST), time measured relative to the fixed stars; thus, the sidereal day is the period during which the earth completes one rotation on its axis so that some chosen star appears twice on the observer's celestial meridian. ..... Click the link for more information. . sidereal dayThe interval between two successive passages of a catalog equinox across a given meridian. It is divided into 24 sidereal hours. The sidereal day is 3 minutes 56 seconds shorter than the mean solar day.Sidereal day(religion, spiritualism, and occult)A sidereal day is the period of time it takes for Earth to complete one rotation on its axis with respect to a fixed point in space. Specifically, a sidereal day begins and ends when the local meridian for any given location on Earth passes through 0° Aries (the vernal point). Because of the motion of Earth around the Sun, sidereal days are slightly shorter than ordinary solar days. A sidereal day is 23 hours 56 minutes and 4.09 seconds in length; a sidereal hour is ½4 the length of a sidereal day. sidereal day[sī′dir·ē·əl ′dā]sidereal daysidereal daySlightly less than the 24 hours of a solar day (23 hours, 56 minutes, 4.1 seconds). Used in astronomy, sidereal means "when a star crosses the meridian" (the meridian is an imaginary circle around the earth). For example, at noon, the sun and stars are overhead, but 23 hours, 56 minutes and 4.1 seconds later, the earth is back in relation to the stars, but not the sun, which takes approximately four minutes longer.sidereal day
Synonyms for sidereal day
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