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At 23:52:47 UT Saturday 14 September 2019
the waning moon’s phase was
is 23.8963888888889 in decimal hours.
The Julian date was 2458741.49404394.
The sun’s ecliptic longitude was 171.863079422993 degrees.
Its mean anomaly was 250.9044426272 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.)