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The full moon.

At 04:08:55 UT Monday 21 January 2019
the moon’s phase is

FULL

Time Zone:   

Some factors that go into this equation:

Universal Time is 4.16527777777778 in decimal hours.
The Julian date is 2458505.49996513.
The sun’s ecliptic longitude is 300.825065967332 degrees.
Its mean anomaly is 17.4813366239 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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