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

The new moon.

At 11:51:49 UT Thursday 25 May 2017
the moon’s phase will be


Time Zone:   

Some factors that go into this equation:

Universal Time is 11.8802777777778 in decimal hours.
The Julian date will be 2457898.50173345.
The sun’s ecliptic longitude will be 64.482608431783 degrees.
Its mean anomaly will be 140.49588321011 degrees.
The moon’s true longitude will be 59.7102348815353 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.