George Zay wrote: > The shutter had 2 blades. Multiplying the two blades > times 20.8333 RPS to get 41.6666breaks per second. > Then I divided the 101 breaks by 41.6666 to get a > duration of 2.424 seconds. Oh, I forget about the two blades. So with 2.42 sec duration and 23.5deg length we get a velocity of 9.7deg/s which is in fact much more than a satellite has... Rainer