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sidereal day

noun

Astronomy.

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

sidereal day

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First recorded in 1785–95

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Examples have not been reviewed.

Note: For simplicity’s sake, these are all sidereal days, and “day” refers to an Earth day.

From

This figure is known as the "sidereal day" or "stellar day".

From

A diurnal variation of the results would appear as a peak in the lock-in spectrum at a period of the sidereal day, which is 86,164.1 s.

From

A sidereal day is approximately 23 hours, 56 minutes and 4.1 seconds.

From

A deduction of the number of the years from the number of the sidereal days gave, as remainder, the number of civil days in the exeligmos.

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