Sidereal

4 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From WordNet (r) 2.0 [wn]:

  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}]

From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:

  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