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The waning moon.

At 22:26:16 UT Thursday 12 December 2019
the waning moon’s phase will be

99.43% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 22.4544444444444 in decimal hours.
The Julian date will be 2458830.49426975.
The sun’s ecliptic longitude will be 260.636459409907 degrees.
Its mean anomaly will be 338.5678386486 degrees.
The moon’s mean longitude will be 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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