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At 17:20:17 UT Monday 30 April 2018
the waning moon’s phase was
is 17.3547222222222 in decimal hours.
The Julian date was 2458239.49495637.
The sun’s ecliptic longitude was 40.332902495686 degrees.
Its mean anomaly was 115.8408123688 degrees.
The moon’s true longitude was 3468.47783164592 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.)