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

The waxing moon.

At 03:13:20 UT Thursday 18 January 2018
the waxing moon’s phase is

0.97% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 3.2388888888889 in decimal hours.
The Julian date is 2458136.50968112.
The sun’s ecliptic longitude is 297.980285539423 degrees.
Its mean anomaly is 14.725063942 degrees.
The moon’s true longitude is 2109.27350306031 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.