sidereal

1. a. Relating to the stars; starry; astral; as, sidereal astronomy. Source: opted

2. a. 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. Source: opted

3. adj. of or relating to the stars or constellations Source: wordnet

4. adj. (of divisions of time) determined by daily motion of the stars Source: wordnet

5. 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. Source: webster

6. Measuring by the apparent motion of the stars; designated,marked out, or accompanied, by a return to the same position inrespect to the stars; as, the sidereal revolution of a planet; asidereal day. Sidereal clock, day, month, year. See under Clock, Day,etc.-- Sideral time, time as reckoned by sideral days, or, taking thesidereal day as the unit, the time elapsed since a transit of thevernal equinox, reckoned in parts of a sidereal day. This is,strictly, apparent sidereal time, mean sidereal time being reckonedfrom the transit, not of the true, but of the mean, equinoctialpoint. Source: adambom

7. j:100 a. of or relating to the stars or constellations a. (of divisions of time) determined by daily motion of the stars Source: ecdict

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