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The waning moon.

At 11:45:45 UT Friday 18 October 2019
the waning moon’s phase is

80.27% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 11.7791666666667 in decimal hours.
The Julian date is 2458775.30272017.
The sun’s ecliptic longitude is 204.828302304117 degrees.
Its mean anomaly is 283.9188149089 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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