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What is the Julian Date?

April 26, 2017Julian

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What is the Julian Date?

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The Julian Date, not to be confused with the Julian calendar, is a format to represent the time in a single number. Julian Date 0 is a day way in the past, namely the 1st January 4713 before Christ (don’t ask me why). The following days are numbered sequentially, each day starting at noon. This numbering scheme is in wide use, especially in astronomy, and is used for the internal representation of dates in Grace. Some further explanations are given on this page. The convcal utility in $GRACE_HOME/auxiliary/ can be used for about any to Julian date convertion.