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The waning moon.

At 22:08:59 UT Saturday 27 August 2016
the waning moon’s phase is

20.88% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 22.1663888888889 in decimal hours.
The Julian date is 2457627.70881619.
The sun’s ecliptic longitude is 155.030687351822 degrees.
Its mean anomaly is 233.80788622199 degrees.
The moon’s true longitude is 100.6479297283 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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