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The waning moon.

At 20:18:35 UT Tuesday 17 October 2017
the waning moon’s phase is

4.01% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 20.3263888888889 in decimal hours.
The Julian date is 2458043.54005387.
The sun’s ecliptic longitude is 204.66985064726 degrees.
Its mean anomaly is 283.7616201815 degrees.
The moon’s true longitude is 901.580176299385 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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