Simulation: Chang´e 1 orbiter´s journey to the moon

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In the 2nd day, the satellite will conduct its first apogee orbit transfer. The apogee is the point in the orbit the furthest distance from the center of Earth. The apogee of the orbit will be raised gradually by conducting three maneuvers at perigee, the point in the orbit closest to Earth. The maneuvers will happen on the 3rd, 6th and 8th day after launch. The third perigee orbit transfer is the key point for the satellite to enter the Earth-moon transfer orbit.