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sidereal a. 星的,恒星的,以星球的运行为基准的 星的,恒星的,以星球的运行为基准的 sidereal adj 1: of or relating to the stars or constellations; " sidereal bodies"; " the sidereal system" 2: ( of divisions of time) determined by daily motion of the stars; " sidereal time" [ ant: { civil}] 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]
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 twelve portions into which the year is divided; the twelfth part of a year, corresponding nearly to the length of a synodic revolution of the moon, -- whence the name. In popular use, a period of four weeks is often called a month. [ 1913 Webster] Note: In the common law, a month is a lunar month, or twenty- eight days, unless otherwise expressed. -- Blackstone. In the United States the rule of the common law is generally changed, and a month is declared to mean a calendar month. -- Cooley' s Blackstone. [ 1913 Webster] { A month mind}. ( a) A strong or abnormal desire. [ Obs.] -- Shak. ( b) A celebration made in remembrance of a deceased person a month after death. -- Strype. { Calendar months}, the months as adjusted in the common or Gregorian calendar; April, June, September, and November, containing 30 days, and the rest 31, except February, which, in common years, has 28, and in leap years 29. { Lunar month}, the period of one revolution of the moon, particularly a synodical revolution; but several kinds are distinguished, as the { synodical month}, or period from one new moon to the next, in mean length 29 d. 12 h. 44 m. 2. 87 s.; the { nodical month}, or time of revolution from one node to the same again, in length 27 d. 5 h. 5 m. 36 s.; the { sidereal}, or time of revolution from a star to the same again, equal to 27 d. 7 h. 43 m. 11. 5 s.; the { anomalistic}, or time of revolution from perigee to perigee again, in length 27 d. 13 h. 18 m. 37. 4 s.; and the { tropical}, or time of passing from any point of the ecliptic to the same again, equal to 27 d. 7 h. 43 m. 4. 7 s. { Solar month}, the time in which the sun passes through one sign of the zodiac, in mean length 30 d. 10 h. 29 m. 4. 1 s. [ 1913 Webster] 48 Moby Thesaurus words for " sidereal": Cynthian, anagalactic, asteroidal, astral, astrologic, astrologistic, astrologous, astronomic, astrophysical, celestial, circumplanetary, cislunar, empyreal, empyrean, equinoctial, extragalactic, galactic, heavenly, heliacal, intercosmic, interplanetary, intersidereal, interstellar, lunar, lunary, lunate, lunular, lunulate, meteoric, meteoritic, nebular, nebulose, nebulous, planetal, planetarian, planetary, planetesimal, semilunar, solar, sphery, star- spangled, star- studded, starry, stellar, stellary, terrestrial, uranic, zodiacal
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