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Definitions for: Sidereal
[adj] (of divisions of time) determined by daily motion of the stars; "sidereal time"
[adj] of or relating to the stars or constellations; "sidereal bodies"; "the sidereal system"
Webster (1913) Definition: Si*de"re*al, a. [L. sidereus, from sidus, sideris, a
constellation, a star. Cf. Sideral, Consider, Desire.]
1. Relating to the stars; starry; astral; as, sidereal
astronomy.
2. (Astron.) 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 under 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.
Antonyms: civil
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