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sidereal vs. solar day

[ sahy-deer-ee-uhl ]
  1. determined by or from the stars: sidereal time.
  2. of or relating to the stars.
  1. the time interval between two successive transits by the sun of the meridian directly opposite that of the observer; the 24-hour interval from one midnight to the following midnight.
  2. the period of time from sunrise to sunset.

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