Non-linear equations are(constructed) with the restriction of the satellite groundtrace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.
The method of designing special elliptic orbit which was critical inclined, sun synchronous and repeating groundtrace was expounded, and the calculation process of this method was summarized.
阐述了临界倾角太阳同步回归轨道这种特殊椭圆轨道的设计方法，总结了其轨道要素的计算步骤。
3
We stared together at the ground as if to trace the footprint buried under the cement.