sidereal day

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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.

Origin of sidereal day

First recorded in 1785–95 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for sidereal day

light, daylight, sunshine, sunlight, daytime, bright

British Dictionary definitions for sidereal day

sidereal day

  1. See day (def. 5)
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