Apollo 13
TLI, MCC-2, DPS-1
what is important?
mass of the spacecraft, size of the moon, motion of the moon, size of the earth, motion of the earth, 3D
sine & friends
b/c = sinβ
a/c = cosβ
60°=1rad、0.1rad=6°、sin40°=6.4
sin(40)=0.6427876096865393
Motion of the moon around the earth
t = time
4.10^8 2πt*27days
