“julian day”

The following 2 entries include the term julian day.

Julian day calendar

noun

: a system used especially by astronomers of numbering days consecutively from the arbitrarily selected point of the year 4713 b.c. instead of by cycles of days

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Julian day number

noun

: the number of a day in the Julian day calendar (as 2,436,934 for January 1, 1960)

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