Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!caen.engin.umich.edu!sheppard
From: sheppard@caen.engin.umich.edu (Ken  Sheppardson)
Newsgroups: sci.space.shuttle
Subject: Orbits ( was :  Info on Atlantis "secret" )
Message-ID: <40506748.298d@dl298d.engin.umich.edu>
Date: 17 Dec 88 19:12:00 GMT
References: <684@pyuxd.UUCP> <22000011@m.cs.uiuc.edu> <2721@aplcomm.jhuapl.edu> <3115@sugar.uu.net>
Organization: U of M Engineering, Ann Arbor, Mich.
Lines: 15

>>}Say again?  Any satellite orbit, over the long run, spends half its
>>}time with its ground track in the night hemisphere.
> 
>> False.
>> Visualize an orbit over the terminator...
> 
> The terminator moves.
> 
> Over the period of a year, the terminator moves 360 degrees (give or take
> a little depending on which "year" we're talking about).

So just put a satellite directly over the terminator about 2100000 km up
so that it's period is one year :)

Ken Sheppardson                                          sheppard@caen.engin.um.umich