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1 definition found
 for Sideral time
From The Collaborative International Dictionary of English v.0.48 :

  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]

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