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The waning moon.

At 12:29:49 UT Friday 21 February 2020
the moon’s phase is

WANING CRESCENT (4.19% full)

 


Some factors that go into this equation:

Universal Time is 12.5136111111111 in decimal hours.
The Julian date is 2458900.54188762.
The sun’s ecliptic longitude is 332.335353354198 degrees.
Its mean anomaly is 48.1405444481 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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