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Julian day
(redirected from Lilian day)

   Also found in: Wikipedia 0.01 sec.
Julian day [′jül·yən ¦dā]
(astronomy)
The number of each day, as reckoned consecutively since the beginning of the present Julian period on January 1, 4713 B.C.; it 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.


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