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At 16:37:48 UT Monday 18 December 2017
the moon’s phase will be
is 16.6466666666667 in decimal hours.
The Julian date will be 2458105.50150218.
The sun’s ecliptic longitude will be 266.984361184368 degrees.
Its mean anomaly will be 344.7206350908 degrees.
The moon’s true longitude will be 1711.42678178711 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.)