ta for the explanation and yes, whilst simple to point at the nice nasa link, 'tis good to be able to explain it oneself :)
I did think that any orbit could be "geosynchronous" in terms of staying over a fixed spot on the Earths surface, at the expense of fuel to make it stay there...
Need a satellite refulling station for all those geoSynchronous satellites using up (albeit) small bits of fuel (hydrazene?) for station keeping. Opportunity for Esso? - may not be as cheep as 1.30euro/litre though!
Interesting that you should bring it up - the US military is currently looking at satellite "tug-boats". The idea is that there are lots of perfectly good satellites up there that have come to the end of their lives because they've run out of fuel. Instead of spending a billioin dollers on a new satellite, send up a low-cost tug that would hitch onto the old one and take over the guidance/course correction functions.
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I did think that any orbit could be "geosynchronous" in terms of staying over a fixed spot on the Earths surface, at the expense of fuel to make it stay there...
Need a satellite refulling station for all those geoSynchronous satellites using up (albeit) small bits of fuel (hydrazene?) for station keeping. Opportunity for Esso? - may not be as cheep as 1.30euro/litre though!
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