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 10:04:45 UT Tuesday 18 June 2019
the waning moon’s phase is

98.81% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 10.0958333333333 in decimal hours.
The Julian date is 2458653.4881147.
The sun’s ecliptic longitude is 86.90983604839 degrees.
Its mean anomaly is 163.6007052193 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

© 1997–2019 by 3IP.