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

The waning moon.

At 22:03:06 UT Tuesday 30 November 2021
the moon’s phase is

WANING CRESCENT (16.16% full)

Some factors that go into this equation:

Universal Time is 22.0683333333333 in decimal hours.
The Julian date is 2459548.66157254.
The sun’s ecliptic longitude is 248.964301728718 degrees.
Its mean anomaly is 327.2324308324 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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