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The full moon.

At 13:38:16 UT Wednesday 20 October 2021
the moon was

FULL


Some factors that go into this equation:

Universal Time is 13.6544444444444 in decimal hours.
The Julian date was 2459508.49996085.
The sun’s ecliptic longitude was 207.407228826919 degrees.
Its mean anomaly was 286.475342248 degrees.
The moon’s mean longitude on 00 January 1990 was 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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