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The full moon.

At 13:08:07 UT Saturday 22 December 2018
the moon’s phase was

FULL

Time Zone:   

Some factors that go into this equation:

Universal Time is 13.1519444444444 in decimal hours.
The Julian date was 2458475.49935785.
The sun’s ecliptic longitude was 270.660414065339 degrees.
Its mean anomaly was 348.2809861091 degrees.
The moon’s mean longitude 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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