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 16:37:48 UT Saturday 18 November 2017
the moon’s phase was


Time Zone:   

Some factors that go into this equation:

Universal Time is 16.6466666666667 in decimal hours.
The Julian date was 2458075.5001.
The sun’s ecliptic longitude was 236.568986514303 degrees.
Its mean anomaly was 315.1512143992 degrees.
The moon’s true longitude was 1318.82532471704 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

© 1997–2018 by 3IP.