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The waning moon.

At 08:51:45 UT Saturday 24 August 2019
the waning moon’s phase is

42.30% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 8.87916666666667 in decimal hours.
The Julian date is 2458719.92299255.
The sun’s ecliptic longitude is 150.899294770678 degrees.
Its mean anomaly is 229.5891112521 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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