Julian Day Definition
noun
A date expressed as a real number of days counted with GMT noon on 1 January 4713 BC in proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar) as zero; used primarily by astronomers and historians to compare events recorded in different cultures.
Wiktionary
Other Word Forms of Julian Day
Noun
Singular:
Julian day
Plural:
Julian days
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