Descending node - Definition and Overview

The descending node is the point in the orbit of an object where it crosses the plane of the ecliptic from the north celestial hemisphere to the south celestial hemisphere in the direction of motion. Because of this, the descending node of the orbit of the Earth's moon is one of only two places where a lunar or solar eclipse can occur.

The line of nodes is the intersection of the object's orbital plane with the ecliptic, and runs between the ascending and descending nodes.

Descending node and orbital parameters

See also

• Ascending node