To look up the phase of the moon for any (Common Era) date,
just fill out the form below, then hit “Find Phase.”

The waxing moon.

At 17:40:09 UT Friday 29 April 2033
the moon’s phase will be

WAXING CRESCENT (0.57% full)

Some factors that go into this equation:

Universal Time is 17.6858333333333 in decimal hours.
The Julian date will be 2463716.50570734.
The sun’s ecliptic longitude will be 39.731511199334 degrees.
Its mean anomaly will be 115.2306289375 degrees.
The moon’s mean longitude on 00 January 1990 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.)

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