Full Moon and Julian 59-day Cycle

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Full Moon and Julian 59-day Cycle

Palmen, KEV (Karl)
Dear Calendar People

Thinking about Julian Day Numbers (from Gigaseconds etc..), I wondered about the phase of the moon on days whose JDN is divisible by 59. The moon phase of such days would drift very slowly backwards on average, taking about 78 years to drift through an entire cycle of moon phases.

The 17 November was the most recent day whose JDN was divisible by 59 and was the 41588th such day with positive JDN.

Here is how the moon phase changes over this and the next few days whose JDN is divisible by 59:

Lunar Calendars and Eclipse Finder 5.79
http://www.hermetic.ch/lcef/lcef.htm

Convert date
2005-11-17 CE 12:00 (local = GMT) AJD=2,453,692.0000
Gibbous moon (waning), illum. =  90.7%, lunat. and age = [72] 15 days, 10 hrs, 35 mins (52.2%).

2006-01-15 CE 12:00 (local = GMT) AJD=2,453,751.0000
Gibbous moon (waning), illum. =  93.4%, lunat. and age = [74] 15 days, 8 hrs, 48 mins (52.2%).

2006-03-15 CE 12:00 (local = GMT)  AJD=2,453,810.0000
Gibbous moon (waning), illum. =  96.7%, lunat. and age = [76] 15 days, 11 hrs, 29 mins (52.6%).

2006-05-13 CE 12:00 (local = GMT)  AJD=2,453,869.0000
Gibbous moon (waning), illum. =  98.5%, lunat. and age = [78] 15 days, 16 hrs, 16 mins (53.3%).


Full moons will occur on such days thus:

2007-08-28 CE 12:00 (local = GMT) AJD=2,454,341.0000
Full moon (waning), illum. =  99.6%, lunat. and age = [94] 15 days, 12 hrs, 57 mins (52.6%).

2008-04-20 CE 12:00 (local = GMT) AJD=2,454,577.0000
Full moon (waning), illum. =  99.6%, lunat. and age = [102] 14 days, 8 hrs, 4 mins (48.8%).

2009-02-09 CE 12:00 (local = GMT) AJD=2,454,872.0000
Full moon (waxing), illum. =  99.1%, lunat. and age = [112] 14 days, 4 hrs, 4 mins (47.7%).

2009-04-09 CE 12:00 (local = GMT) AJD=2,454,931.0000
Full moon (waxing), illum. =  99.1%, lunat. and age = [114] 13 days, 19 hrs, 54 mins (46.9%).

Karl

07(15(02
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