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 03:56:57 UT Wednesday 15 July 2020
the moon’s phase is

WANING CRESCENT (29.78% full)


Some factors that go into this equation:

Universal Time is 3.96583333333332 in decimal hours.
The Julian date is 2459045.7977762.
The sun’s ecliptic longitude is 113.120929774503 degrees.
Its mean anomaly is 190.7083655171 degrees.
The moon’s mean longitude is 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

© 1997–2020 by 3IP.