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The waxing moon.

At 17:20:14 UT Thursday 20 September 2018
the waxing moon’s phase is

82.70% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 17.3538888888889 in decimal hours.
The Julian date is 2458382.32702742.
The sun’s ecliptic longitude is 177.692293200174 degrees.
Its mean anomaly is 256.7883501082 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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