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  • 51Թ comparison: sidereal day vs. solar day

sidereal day vs. solar day

sidereal day

noun

Astronomy.

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

solar day

noun

  1. Astronomy.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. Law.the period of time from sunrise to sunset.