Astronomical day

	See under Day.
	a period equal to the mean solar day, but beginning at noon instead of at midnight, its twenty-four hours being numbered from 1 to 24; also, the sidereal day, as that most used by astronomers.

See also: Astronomical, Day

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.

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