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sidereal

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sidereal in WordNet English dictionary

adjective
  1. (of divisions of time) determined by daily motion of the stars
    "sidereal time"
    sidereal 
  2. of or relating to the stars or constellations
    "sidereal bodies"; "the sidereal system"
    sidereal 
WordNet Lexical Database v3.0, © 2006 Princeton University