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.

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  • sidereal — 1630s, of or pertaining to the stars, earlier sideral (1590s), from Fr. sidereal (16c.), from L. sidereus starry, astral, from sidus (gen. sideris) star, constellation, probably from PIE root *sweid to shine (Cf. Lith. svidus shining, bright ) …   Etymology dictionary

  • sidereal — index stellar Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • sidereal — *starry, stellar, astral …   New Dictionary of Synonyms

  • sidereal — ► ADJECTIVE ▪ relating to the distant stars or their apparent positions in the sky. ORIGIN from Latin sidus star …   English terms dictionary

  • sidereal — [sī dir′ē əl] adj. [< L sidereus < sidus (gen. sideris), a star < IE base * sweid , to gleam > Lith svidù, to gleam] 1. of or pertaining to the stars 2. expressed in reference to the stars sidereally adv …   English World dictionary

  • Sidereal — The adjective sidereal can refer to various things, including:* Measurements of time: ** Sidereal time ** Sidereal day ** Sidereal month ** Sidereal year * Sidereal period of an object orbiting a star * Sidereal astrology * Sidereus Nuncius, or… …   Wikipedia

  • 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

  • sidereal — Of or pertaining to the stars. Although sidereal generally refers to the stars and tropical to the vernal equinox, sidereal time and the sidereal day are based upon the position of the vernal equinox relative to the meridian. The sidereal year is …   Aviation dictionary

  • sidereal — adjective /saɪˈdɪəriəl,saɪˈdɪriəl,səˈdɪriəl/ a) Of or relating to the stars. The field of sidereal astronomy, therefore, was virtually untrodden when, shortly after the beginning of his telescopic work, Herschel began his first review of the… …   Wiktionary

  • sidereal — Month Month (m[u^]nth), n. [OE. month, moneth, AS. m[=o]n[eth], m[=o]na[eth]; akin to m[=o]na moon, and to D. maand month, G. monat, OHG. m[=a]n[=o]d, Icel. m[=a]nu[eth]r, m[=a]na[eth]r, Goth. m[=e]n[=o][thorn]s. [root]272. See {Moon}.] One of… …   The Collaborative International Dictionary of English

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