julian day's

Julian Day

noun Astronomy.
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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Julian day's is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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