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north node- black moon cycle

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Joined: 17 Jun 2004
Posts: 397
Location: Wales

Posted: Fri Sep 08, 2006 10:04 am    Post subject: north node- black moon cycle Reply with quote

I am intrigued by the cycle of the black moon ( moon apogee) and the node ( mean position), which runs on an almost exact 6 year cycle. That is to say every six years when the conjunction happens it does so when the sun is at the same place (well to be precise 1 degree and 5 mins less)
Of course the dates below don't look quite right for that - but once you build in leap years it is perfect.

20-Sep-55 14:13 21Sg31' R
18-Sep-61 22:32 25Le32' R
18-Sep-67 06:52 29Ar32' R
16-Sep-73 15:12 03Cp34' R
15-Sep-79 23:33 07Vi34' R
14-Sep-85 07:55 11Ta35' R
13-Sep-91 16:17 15Cp36' R
12-Sep-97 00:41 19Vi36' R
11-Sep-03 09:05 23Ta37' R
09-Sep-09 17:30 27Cp38' R
09-Sep-15 01:55 01Li39' R
07-Sep-21 10:22 05Ge39' R
06-Sep-27 18:49 09Aq40' R
05-Sep-33 03:17 13Li41' R
04-Sep-39 11:46 17Ge41' R
02-Sep-45 20:16 21Aq43' R

You'll note that it is currently occurring at about 18 Virgo and that the 1997 conjunction actually occurred at that degree.

Thing is I can't find anything about this cycle and wondered if any of you knew of any articles etc about any of the maths of it ( reason why it moves as it does- does it tie with saros cycles or something?) or the effects. Thanks
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Martin Lewicki

Joined: 23 Mar 2007
Posts: 46

Posted: Thu Apr 12, 2007 3:02 pm    Post subject: Reply with quote

A node cycle is 18.613 years
A anomalistic cycle is 8.85 years


1/18.613 + 1/8.850 = 1/5.998

reciprocal is 5.998 years or almost exaclty 6 years with a mean error of about 0.7 days.

There may indeed be a resonance between the two as there are resonances between many of the planet and asteroid orbits.

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