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The waning moon.

At 11:03:28 UT Wednesday 13 November 2019
the waning moon’s phase is

99.21% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 11.0744444444444 in decimal hours.
The Julian date is 2458801.49208109.
The sun’s ecliptic longitude is 230.807690260478 degrees.
Its mean anomaly is 309.5167041919 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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