| sidereal | 1. Relating to the stars; starry; astral; as, sidereal astronomy. 2. <astronomy> Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars; as, the sidereal revolution of a planet; a sidereal day. Sidereal clock, day, month, year. See Clock, Day, etc. Sideral time, time as reckoned by sideral days, or, taking the sidereal day as the unit, the time elapsed since a transit of the vernal equinox, reckoned in parts of a sidereal day. This is, strictly, apparent sidereal time, mean sidereal time being reckoned from the transit, not of the true, but of the mean, equinoctial point. Origin: L. Sidereus, from sidus, sideris, a constellation, a star. Cf. Sideral, Consider, Desire. Source: Websters Dictionary (01 Mar 1998) |
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| sidereal | (of divisions of time) determined by daily motion of the stars |
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| sidereal | of or relating to the stars or constellations |
| sidereal | the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day |
| sidereal | 1/24 of a sidereal day |
| sidereal | period between successive conjunctions with a star, 27.322 days |
| sidereal | measured by the diurnal motion of stars |
| sidereal | the time for the earth to make one complete revolution around the sun, relative to the fixed stars |
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