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 09:05:04 UT Thursday 25 August 2016
the waning moon’s phase is

47.44% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 9.10111111111111 in decimal hours.
The Julian date is 2457625.97443382.
The sun’s ecliptic longitude is 152.573783980421 degrees.
Its mean anomaly is 231.30001832162 degrees.
The moon’s true longitude is 65.504731962701 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.