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The waning moon.

At 02:48:21 UT Sunday 28 August 2016
the waning moon’s phase is

19.17% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 2.82250000000001 in decimal hours.
The Julian date is 2457628.69170751.
The sun’s ecliptic longitude is 155.218141838416 degrees.
Its mean anomaly is 233.99910637231 degrees.
The moon’s true longitude is 103.285321398679 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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