Anorbital pole is either end of an imaginary line running through the center of an orbit perpendicular to the orbital plane. It is similar in concept to a geographical pole but based on the planet's orbit instead of the planet's rotation.
The north orbital pole of a celestial body is defined by the right-hand rule: If you curve the fingers of your right hand along the direction of orbital motion, with your thumb extended parallel to the orbital axis, the direction your thumb points is defined to be north.
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