Sidereal clock
Sidereal 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. [1913 Webster]

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. [1913 Webster]

{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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Sidereal clock — Clock Clock (kl[o^]k), n. [AS. clucge bell; akin to D. klok clock, bell, G. glocke, Dan. klokke, Sw. klocka, Icel. klukka bell, LL. clocca, cloca (whence F. cloche); al perh. of Celtic origin; cf. Ir. & Gael. clog bell, clock, W. cloch bell. Cf.… …   The Collaborative International Dictionary of English

  • sidereal clock — noun : an astronomical clock regulated to sidereal time …   Useful english dictionary

  • Sidereal time — is a measure of the position of the Earth in its rotation around its axis, or time measured by the apparent diurnal motion of the vernal equinox, which is very close to, but not identical to, the motion of stars. They differ by the precession of… …   Wikipedia

  • Sidereal — 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. [1913 Webster] 2. (Astron.) Measuring by the apparent motion of… …   The Collaborative International Dictionary of English

  • Clock — (kl[o^]k), n. [AS. clucge bell; akin to D. klok clock, bell, G. glocke, Dan. klokke, Sw. klocka, Icel. klukka bell, LL. clocca, cloca (whence F. cloche); al perh. of Celtic origin; cf. Ir. & Gael. clog bell, clock, W. cloch bell. Cf. {Cloak}.] 1 …   The Collaborative International Dictionary of English

  • sidereal — adj. of or concerning the constellations or fixed stars. Phrases and idioms: sidereal clock a clock showing sidereal time. sidereal day the time between successive meridional transits of a star or esp. of the first point of Aries, about four… …   Useful english dictionary

  • Clock drive — mechanism in the pier of the german equatorial mount for the 8 inch refracting telescope at Aldershot Observatory. In astronomy a Clock drive is a regulatory mechanism used to move an equatorial mounted telescope along one axis to keep the… …   Wikipedia

  • Clock — For other uses, see Clock (disambiguation). Timepiece redirects here. For the Kenny Rogers album, see Timepiece (album). Platform clock at King s Cross railway station, London …   Wikipedia

  • Sidereal hour — Hour Hour, n. [OE. hour, our, hore, ure, OF. hore, ore, ure, F. heure, L. hora, fr. Gr. ?, orig., a definite space of time, fixed by natural laws; hence, a season, the time of the day, an hour. See {Year}, and cf. {Horologe}, {Horoscope}.] 1. The …   The Collaborative International Dictionary of English

  • Sidereal time — Time Time, n.; pl. {Times}. [OE. time, AS. t[=i]ma, akin to t[=i]d time, and to Icel. t[=i]mi, Dan. time an hour, Sw. timme. [root]58. See {Tide}, n.] 1. Duration, considered independently of any system of measurement or any employment of terms… …   The Collaborative International Dictionary of English

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