sheppard@caen.engin.umich.edu (Ken Sheppardson) (12/18/88)
>>}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
peter@sugar.uu.net (Peter da Silva) (12/18/88)
In article <40506748.298d@dl298d.engin.umich.edu>, sheppard@caen.engin.umich.edu (Ken Sheppardson) writes: Me: > > 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 :) A bit far up for a spy satellite. -- Peter "Have you hugged your wolf today" da Silva `-_-' peter@sugar.uu.net
jwm@stdc.jhuapl.edu (Jim Meritt) (12/23/88)
In article <3118@sugar.uu.net> peter@sugar.uu.net (Peter da Silva) writes: }In article <40506748.298d@dl298d.engin.umich.edu>, sheppard@caen.engin.umich.edu (Ken Sheppardson) writes: }> So just put a satellite directly over the terminator about 2100000 km up }> so that it's period is one year :) }A bit far up for a spy satellite. Sort of depends with what you are spying where on whom. Close is not always better. Look up elint, for instance... Disclaimer: "It's mine! All mine!!!" - D. Duck