“嫦娥一号”探月卫星发射升空实施星箭分离后,先进入绕地调相轨道飞行,经四次变轨后进入地月转移轨道奔驰,再经一次中途轨道修正,到达近月点时经首次制动减速进入环月轨道飞奔,又经两次制动最终才进入绕月工作轨道运行。这一过程构成了一个美丽的画面,可以从示意图上形象地展现出来。同学们不禁要问:卫星的四次变、 “Chang’e No. 1” launches and launches the moon and launches the spacecraft. After the separation of the stars and arrows, it first enters a ground-phase orbiting orbit. After four orbital shifts, it enters the earth-month orbital track and runs through a mid-course orbit correction. At the time of the month, the first brake deceleration enters the orbit of the moon and it flies again. After two brakes, it finally enters the orbital orbit of the moon. This process constitutes a beautiful picture that can be visually represented on the schematic diagram. The students could not help asking: the four changes of the satellite