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 01:39:34 UT Wednesday 13 June 2018
the waning moon’s phase was

0.87% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 1.67611111111111 in decimal hours.
The Julian date was 2458282.50869736.
The sun’s ecliptic longitude was 82.033696114266 degrees.
Its mean anomaly was 158.5653968168 degrees.
The moon’s mean longitude was 318.351648 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.