earth moon sun system 地球月日体系
The dynamics of the Earth-Moon system is quite different from the Sun-Earth system especially after a long duration for the gravitational attraction of the Sun.
由于在地-月系统中太阳的引力不可忽略，特别是在长时间作用以后，其动力学行为与摄动力较小的日-地系统有明显的不同。
He placed a fixed sun at the centre of the solar system with the planets going round it and only the moon still going round the earth.
他安置了固定的太阳在太阳系的中心与行星去围绕它的和仍然去围绕地球的仅月亮的。
He placed a fixed sun at the centre of the solar system with the planets going round it and only the moon still going round the earth.
他把太阳固定在太阳系的中心位置上，而行星则围绕着太阳转，只有月球仍然绕着地球转。
应用推荐