Edit made on July 23, 2009 by GuestEditor at 14:28:33
Deleted text in red /
Inserted text in green
WW
HEADERS_END
The speed you must go to be in orbit.
Slightly misleading, as your orbital velocity depends on your orbital height:
the higher your orbit, the slower you go.
It's relatively easy to compute orbital velocity for an Earth grazing orbit,
and that's intimately related to the calculation of the distance to the horizon.
Escape velocity is larger by a factor of EQN:\sqrt{2}, which is interesting.