Julian Day
- a serial number equal to the number of days elapsed since January 1, 4713 b.c., proposed by Joseph Scaliger in 1582 and used in astronomical calculations: January 1, 1965, at noon, Greenwich Civil Time, was Julian Day 2,438,762.0. Abbreviation: J.D.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018