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The waning moon.

At 15:15:44 UT Thursday 13 August 2020
the moon’s phase is

WANING CRESCENT (31.55% full)

 


Some factors that go into this equation:

Universal Time is 15.2788888888889 in decimal hours.
The Julian date is 2459074.81549227.
The sun’s ecliptic longitude is 141.300365533697 degrees.
Its mean anomaly is 219.7567506565 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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