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The orbital plane of an object orbiting another is the geometrical plane in which the orbit is embedded. Three points are required to find the orbital plane: the center of the heavier object, the center of the orbiting object and the center of the orbiting object at some later time.
By definition the inclination of a planet in the solar system is the angle between its orbital plane and that of the Earth. In other cases, for instance a moon orbiting another planet, it is convenient to define the inclination of the moon's orbit as the angle between its orbital plane and the planet's equator.
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