After reading Dr. Sagan's remarks on the Serpo project, which is about 60 jam-packed pages of calculations, I found one paragraph which states that in order to use Kepler's law - in the case of Planet Serpo - one had to vary the exact gravitational pull placed on Serpo by the two suns. Serpo did not have large planets, like Jupiter and Saturn to affect the gravitational pull as the Earth does. Serpo's gravitational pull was different than anything Dr. Sagan had ever seen before.
There are numerous figures and calculations to support this. I will forward them at a later date. Have your list stay tuned.
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