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The waning moon.

At 23:43:36 UT Saturday 14 December 2019
the waning moon’s phase is

91.03% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 23.7433333333333 in decimal hours.
The Julian date is 2458832.41028979.
The sun’s ecliptic longitude is 262.724093701594 degrees.
Its mean anomaly is 340.592066275 degrees.
The moon’s mean longitude is 318.351648 degrees.

These calculations incorporate the switch to the English New Style (N.S.)—i.e., Gregorian— calendar after Wednesday, 02 September 1752; the next day became Thursday, 14 September, skipping eleven days. (Please also note that, while fairly accurate, these calculations remain a bit buggy.)

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