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The waxing moon.

At 22:26:16 UT Thursday 26 December 2019
the moon’s phase was

WAXING CRESCENT (0.58% full)


Some factors that go into this equation:

Universal Time is 22.4544444444444 in decimal hours.
The Julian date was 2458843.50580621.
The sun’s ecliptic longitude was 274.880933926906 degrees.
Its mean anomaly was 352.366901638 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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