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The waning moon.

At 10:42:33 UT Sunday 15 December 2019
the waning moon’s phase is

87.86% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 10.7258333333333 in decimal hours.
The Julian date is 2458833.37857575.
The sun’s ecliptic longitude is 263.189369263079 degrees.
Its mean anomaly is 341.043102612 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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