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

The waning moon.

At 07:49:28 UT Tuesday 31 May 2016
the waning moon’s phase is

29.95% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 7.84111111111111 in decimal hours.
The Julian date is 2457539.79953324.
The sun's ecliptic longitude is 70.3085585355 degrees.
Its mean anomaly is 146.48259918617 degrees.
The moon’s true longitude is 3.94510972688153 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

© 1997–2016 by 3IP.