降交点
- 网络Descending node;dragon's tail
降交点-
当月球运行到黄道和白道的升交点和降交点附近时，才会日食。
Only when the moon to run , and yellow or white Road intersection near the intersection and down only when a solar eclipse .
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在轨道六要素的基础上，分析了卫星太阳同步轨道设计时降（升）交点地方时、升交点赤经，以及冻结轨道参数等的确定方法。
The determination method of descending / ascending node , longitude of ascending node and frozen orbit parameters for sun-synchronous orbit satellite design was analyzed on the basis of six general orbital elements .