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The waning moon.

At 01:06:05 UT Sunday 21 July 2019
the waning moon’s phase is

84.79% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 1.11805555555556 in decimal hours.
The Julian date is 2458686.34791915.
The sun’s ecliptic longitude is 118.006661475795 degrees.
Its mean anomaly is 195.7583628579 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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