The 600-plus-kilogram satellite will circle the Earth once every 90 minutes after it enters a sun-synchronousorbit at an altitude of 500 kilometers.
墨子号质量在600千克以上，进入距地面高度500公里的太阳同步轨道后，每90分钟环绕地球一圈。
2
The effect of the flat rate of the earth on the orbit planes of satellites is discussed and the design principle of sun-synchronous orbit of satellites is introduced.
讨论地球扁率对人造地球卫星轨道平面的影响，介绍卫星的太阳同步轨道设计原理。
3
Repeat sun-synchronousorbit is one of the most important orbits for earth observation missions, because the orbit can satisfy the requirements of illumination and temporal resolution.