To look up the phase of the moon for any (Common Era) date,
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The full moon.

At 21:16:01 UT Saturday 27 February 2021
the moon was


Some factors that go into this equation:

Universal Time is 21.2836111111111 in decimal hours.
The Julian date was 2459273.49614214.
The sun’s ecliptic longitude was 339.50186009556 degrees.
Its mean anomaly was 55.1615329953 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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