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sidereal day vs. solar day


noun
  1. the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day.

noun
  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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