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At 15:33:24 UT Saturday 31 March 2018
the moon’s phase was
is 15.5733333333333 in decimal hours.
The Julian date was 2458209.4997649.
The sun’s ecliptic longitude was 10.877608683433 degrees.
Its mean anomaly was 86.1982324585 degrees.
The moon’s true longitude was 3072.63466216809 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.)