Julian Day
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Julian Day
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The number of each day, as reckoned consecutively since the beginning of
the present Julian period on January 1, 4713 B.C.
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The Julian day is used primarily by astronomers to avoid confusion due
to the use of different calendars at different times and places. The Julian
day begins at noon, 12 hours later than the corresponding civil day.
The day beginning at noon January 1, 1965, is Julian day 2,438,395.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
