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The waning moon.

At 20:09:50 UT Tuesday 17 October 2017
the waning moon’s phase is

4.03% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 20.1805555555556 in decimal hours.
The Julian date is 2458043.54030596.
The sun’s ecliptic longitude is 204.663813858031 degrees.
Its mean anomaly is 283.7556310049 degrees.
The moon’s true longitude is 901.500590025765 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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