from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The surface (plane) that contains an orbit.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (astronomy) the plane on which a body is orbiting
Sorry, no etymologies found.
The ascending node is the one when the planet is moving northwards, and the line of intersection of the orbital plane with the ecliptic is the line of nodes.