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The waning moon.

At 20:19:04 UT Tuesday 20 August 2019
the waning moon’s phase is

76.22% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 20.3344444444444 in decimal hours.
The Julian date is 2458716.26221869.
The sun’s ecliptic longitude is 147.505026123878 degrees.
Its mean anomaly is 226.116974504 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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