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 00:05:53 UT Sunday 23 January 2022
the moon’s phase is

WANING GIBBOUS (76.41% full)


Some factors that go into this equation:

Universal Time is 0.114722222222222 in decimal hours.
The Julian date is 2459603.26412568.
The sun’s ecliptic longitude is 302.965258938592 degrees.
Its mean anomaly is 19.5557831291 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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