Astronomy Answers: From the Astronomical Dictionary

# Astronomy AnswersFrom the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the Chronological Julian Day Number

The Chronological Julian Day Number (CJDN) counts the number of whole days since midnight local time at the beginning of January 1st, −4712 on the Julian proleptic calendar. You get the Chronological Julian Day Number if you round a Chronological Julian Date (CJD) down to the nearest whole value.