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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.
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Nearby words for julian day
julian of norwich