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The waning moon.

At 13:51:46 UT Sunday 19 January 2020
the waning moon’s phase is

28.19% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 13.8794444444444 in decimal hours.
The Julian date is 2458867.7819437.
The sun’s ecliptic longitude is 298.955985514432 degrees.
Its mean anomaly is 15.6702746045 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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