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**1. Homework Statement**

A satellite GeoSAT is in a circular geostationary orbit of radius R

_{G}above a point P on the equator. Another satellite ComSAT is in a lower circular orbit of radius 0.81R

_{G}. At 7 P.M. on January 1, ComSAT is sighted directly above P. On which day among the following can ComSAT be sighted directly above P between 7 P.M. and 8 P.M. ??

(a) Jan 3

(b) Jan 9

(c) Jan 15

(d) Jan 21

**2. The attempt at a solution**

I am sorry but I am unable to think of any possible way to solve this problem. Will Keplar's equations help?? I am totally confused!! Please help!!

For your assistance, the answer given is January 9.

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