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

The full moon.

At 17:40:09 UT Tuesday 12 July 2033
the moon will be

FULL


Some factors that go into this equation:

Universal Time is 17.6858333333333 in decimal hours.
The Julian date will be 2463791.49853202.
The sun’s ecliptic longitude will be 110.664837842288 degrees.
Its mean anomaly will be 188.1685333102 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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