http://en.wikipedia.org/wiki/Navagraha
It is interesting that neither Rahu nor Ketu are given yantras, and
that Budha/Mercury's is so asymmetric. Might there be some relation
between the rather spirograph-like yantras of the other bodies and
epicycles?
-Dave
:: :: ::
6 is to 28 as 18 is to 84, but that doesn't necessarily say much.
Probably the night sky is the best way to answer this question, but
there are some interesting animations of epicyclic models at:
http://www.csit.fsu.edu/~dduke/models
(is there a reference frame in which Sol IV and V have similar periods,
and Sol II and VI beat against each other?)
