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 03:41:32 UT Sunday 11 April 2021
the moon’s phase is

WANING CRESCENT (0.86% full)


Some factors that go into this equation:

Universal Time is 3.70888888888889 in decimal hours.
The Julian date is 2459315.50860414.
The sun’s ecliptic longitude is 21.492628244744 degrees.
Its mean anomaly is 96.8225993825 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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