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At 17:13:30 UT Saturday 20 April 2019
the waning moon’s phase is
is 17.2416666666667 in decimal hours.
The Julian date is 2458594.47930163.
The sun’s ecliptic longitude is 30.352748785285 degrees.
Its mean anomaly is 105.7409808482 degrees.
The moon’s mean longitude is 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.)