descending node

When passing to the north of the ecliptic, it is called the ascending node; when to the south of it, the descending node.

Rahu's head marks the ascending, Ketu, the tail, the descending node.

If the moon is between her ascending and descending node, the correction is positive, and we take the larger arc.

It remained less than 2¼ hours north of the ecliptic, passing from the ascending to the descending node of its orbit in 2h 13m·4.

Moreover, they recur alternately at the ascending and descending node.