Re: Doomsday Dec 21 2012

In article <Xns9A5621F642ABcanopus56yahoocom@xxxxxxxxxxxxx>,
canopus56 <canopus56NOSPAM@xxxxxxxxx> wrote:

<snip>

You might find this web doc of interest regarding the frequency of
triplet planetary groupings for Jupiter, Venus and Mars:

http://webpages.charter.net/darksky25/Astronomy/Articles/April2000.html
http://webpages.charter.net/darksky25/Astronomy/Articles/March2000.html

The author did not state the conjunction tolerance used, but state that
groupings for those three planets occur on average every 18 1/2 years.

See also Brian Monson's page computing the frequencies of three planet
conjunctions between Mars, Jupiter and Saturn within 10 degrees at once
every 100 years.

http://drumright.ossm.edu/astronomy/conjunctions.html

Meeus discusses the frequency of conjunctions & alignments in some
detail, in his _Mathematical Morsels_ IIRC.

--
Odysseus
.

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