Mike Tullett wrote:
On 6 Jun 2005 05:25:14 -0700, Edmund Lewis wrote in
roups.com

As in sunspots? I'm familiar with the theories that they affect the
weather, I thought the sunspot cycle was 11 years?

I believe there is what is called the double sunspot cycle - related to a
reversal of the sun's magnetic poles - of about 22-23 years. When some
climate data are analysed that can be quite a strong signal.

http://zebu.uoregon.edu/~soper/Sun/cycle.html
I see what you mean.


linked to the period of
lunar nodes. (Lunar nodes are periods when the combination of the 5
degree difference of the lunar orbit combines with the eccliptic to
produce declinations of 23 1/2 degrees plus or minus 5 degrees.*


So are you saying that the declination of the moon (which I know can be
more than 23 1/2, up to about 29 north and south), combines with the
sunspot cycle to produce hot/cold weather? If so, how? (And what type
of weather do various alignments produce?)

The lunar nodal cycle has a length of 18.6 years

Is that the interval between the moon's being in the exact same place
in the sky, the same declension or something completely different?

and such a cycle length
(real or otherwise) has been detected in some climate data. I don't think
the causal mechanism has been worked out though.

Thanks.

Edmund