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Ascending node

The plane of a planet's orbit (or other Solar System object) is usually tilted with respect to the plane defined by the Solar System (the ecliptic). These 2 great circles intersect at 2 points. As the planet travels around its orbit, at one of the intersection points it will pass from below the ecliptic plane to above it (i.e. Northward). This point is called the ascending node.

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