To look up the phase of the moon for any date,
just fill out the form below, then hit "Find Phase."
At 17:20:17 UT Wednesday 17 January 2018
the moon’s phase was
is 17.3547222222222 in decimal hours.
The Julian date was 2458135.50348189.
The sun’s ecliptic longitude was 297.56122119667 degrees.
Its mean anomaly was 14.3191346609 degrees.
The moon’s true longitude was 2104.32689052607 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.)