Line-of-Nodes
In space and astronautical engineering, the Line-of-Nodes is an imaginary line that intersects the orbital plane of a celestial body at two points, one ascending and one descending. It is the intersection of the plane of reference (usually the ecliptic) with the orbital plane of the orbiting body. The ascending node is the point where the orbiting body crosses the plane of reference moving from south to north, while the descending node is the point where it crosses the plane of reference moving from north to south. The line connecting these two points is the Line-of-Nodes. It is an important concept in space mission planning and navigation, as it defines the orientation of the orbit and the position of the orbiting body relative to the reference plane.
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