Julian day

The Julian day or Julian day number (JDN) is the number of days that have elapsed since 12 noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC in the proleptic Julian calendar {{fn|1}}. That day is counted as Julian day zero. The Julian day system was intended to provide astronomers with a single system of dates that could be used when working with different calendars and to unify different historical chronologies.

Related Topics:
Day - Noon - Greenwich Mean Time - Monday - January 1 - 4713 BC - Proleptic Julian calendar

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