>>Just watched the last shuttle launch.
>>
>>End of an era.
>
>Just looked at this link:
http://www.bbc.co.uk/news/world-14077893 (the 'live' positions thing at the bottom) which currently shows the shuttle at 227km altitude and *descending" whilst the space shuttle is at an altitude of 400Km.
>
>Why would that be?
Probably because of an elliptical orbit.
Any elliptical orbit has an apogee (highest point) and perigee (lowest point). During travel from the former to the latter, the spacecraft's altitude is decreasing.
http://en.wikipedia.org/wiki/Hohmann_transfer_orbit
Regards. Al
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