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(5) ORBITS ARE CONIC SECTIONS -> CIRCLES OR ELLIPSES (SPHERICALLY SYMMETRIC EARTH, NOTHING BUT GRAVITY) -> LIE IN A PLANE PLANE GOES THROUGH CENTER OF EARTH PLANE CAN BE INCLINED AT ANY ANGLE TO EQUATOR LAUNCH WINDOW: MIR IS IN ORBIT (~245 mi... ABOUT CIRCULAR) ^ | - ABOVE EARTH SHUTTLE IS ON LAUNCH PAD EARTH IS ROTATING UNDER MIR WANT TO LAUNCH INTO SAME PLANE (HIT IT AT BEGINNING OF LAUNCH WINDOW) -> IF YOU MISS, SHUTTLE HAS TO STEER (YAW STEER) DURING LAUNCH TO GET TO THAT PLANE -> COSTS FUEL (ET) HAVE TO WAIT ABOUT 24 HRS... EARTH TO ROTATE ONCE AROUND... SO WILL LAUNCH ON FRIDAY.. OR SATURDAY AT ABOUT THE SAME TIME