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At 17:57:41 UT Thursday 21 March 2019
the waning moon’s phase was
is 17.9780555555556 in decimal hours.
The Julian date was 2458564.49304107.
The sun’s ecliptic longitude was 0.830125001707984 degrees.
Its mean anomaly was 76.2018026466 degrees.
The moon’s mean longitude 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.)