ive learned how to calculate the radius of a satalite which goes around the earth at 1 hour, 44 mins and 25 seconds. it was around 730 KM. which shouldnt be correct, because of the ISS sees the sun rises 6 times a day, which means once in 4 hours. the ISS is about 400 KM from earth surface. the closer you get to earth, the fast you will go around. when i said this my physics teacher started to break his head over it. I still dont know whats the problem here, neither does he