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 21:23:39 UT Thursday 01 August 2019
the moon’s phase was

WAXING CRESCENT (0.90% full)


Some factors that go into this equation:

Universal Time is 21.4108333333333 in decimal hours.
The Julian date was 2458696.50897563.
The sun’s ecliptic longitude was 129.319936957569 degrees.
Its mean anomaly was 207.4338805603 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

© 1997–2020 by 3IP.