To look up the phase of the moon for any date,
just fill out the form below, then hit "Find Phase."

The full moon.

At 13:27:26 UT Tuesday 11 April 2017
the moon’s phase was


Time Zone:   

Some factors that go into this equation:

Universal Time is 13.4738888888889 in decimal hours.
The Julian date was 2457855.49901133.
The sun’s ecliptic longitude was 21.861365936364 degrees.
Its mean anomaly was 97.19284696986 degrees.
The moon’s true longitude was 205.465068609506 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.)

 Send comments to

© 1997–2017 by 3IP.