sidereal

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 heavens.

b) Relating to a measurement of time relative to the position of the stars.

Then, from a sufficient number of observations of synodic periods to give their mean, we obtain the sidereal period, or period with reference to the stars.


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  • 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

  • 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 — 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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