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 07:58:33 UT Friday 23 June 2017
the waning moon’s phase is

0.95% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 7.99249999999999 in decimal hours.
The Julian date is 2457927.50952398.
The sun’s ecliptic longitude is 92.056469027524 degrees.
Its mean anomaly is 168.91999079989 degrees.
The moon’s true longitude is 80.8555474305564 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

© 1997–2017 by 3IP.