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The full moon.

At 17:50:50 UT Thursday 28 June 2018
the moon’s phase was

FULL

Time Zone:   

Some factors that go into this equation:

Universal Time is 17.8638888888889 in decimal hours.
The Julian date was 2458298.49740914.
The sun’s ecliptic longitude was 96.983032836645 degrees.
Its mean anomaly was 174.0149171781 degrees.
The moon’s true longitude was 4242.81826091746 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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