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The waning moon.

At 22:24:40 UT Thursday 21 March 2019
the waning moon’s phase was

98.88% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 22.4277777777778 in decimal hours.
The Julian date was 2458564.48883964.
The sun’s ecliptic longitude was 1.01431644989202 degrees.
Its mean anomaly was 76.3845466859 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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