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.

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Other Word Forms of Julian Day

Noun

Singular:
Julian day
Plural:
Julian days

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Julian day