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The waxing moon.

At 12:30:59 EST* Wednesday 06 December 1989
the moon’s phase was

WAXING GIBBOUS (57.66% full)


*17:30:59 Universal Time

Some factors that go into this equation:

Universal Time (UT) was 17:30:59, Wednesday, 12/06/1989.
(That’s 17.5330555555556 in decimal hours.)
The Julian date was 2447867.07661855.
The sun’s ecliptic longitude was 254.6041953242 degrees.
Its mean anomaly was 332.713755834407 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.)

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