To look up the phase of the moon for any (Common Era) date,
just fill out the form below, then hit “Find Phase.”

The waxing moon.

At 21:00:00 UT Monday 28 October 2019
the moon’s phase was

WAXING CRESCENT (0.73% full)

Some factors that go into this equation:

Universal Time is 21.0166666666667 in decimal hours.
The Julian date was 2458784.50730332.
The sun’s ecliptic longitude was 215.175597492631 degrees.
Its mean anomaly was 294.1546600334 degrees.
The moon’s mean longitude on 00 January 1990 was 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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