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At 18:38:30 UT Saturday 20 October 2018
the waxing moon’s phase is
is 18.6583333333333 in decimal hours.
The Julian date is 2458412.34684933.
The sun’s ecliptic longitude is 207.342623585456 degrees.
Its mean anomaly is 286.4113425589 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.)