In article , Greg D. Moore
(Strider) wrote:
And not only that, except on a perfect sphere, with a separation of 1
mile or so, that will gradually change over time.

Even over a "perfect sphere", the differential drag would move ISS and HST
apart rapidly.

Fair enough. Ok, perfect sphere in a vacuum. :-)

This is rapidly turning into an exam question. Assuming a point satellite...

--
-Andrew Gray