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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