Determining the attainability domain of aeroassisted orbital plane change, i.e. the inclination and the longitude of the ascending node, is a very important problem.
Naturally, this means that there are two crossover points – or two nodes, an ascending node and a descending node – that mark the point whereby the moon goes from one side over to the other.
变轨时，确定可达范
(变轨结束时的倾角
点赤经)是一个十分重要的问题。
， 
味着有两个
叉
- 或两个节
