Astronomy Answers
From the Astronomical Dictionary

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planetocentric

planètès astèr = [Greek] wandering star; kentrum = [Greek] middle, center

Planetocentric means: with a planet at the center, or relative to the center of a planet. Planetocentric coordinate systems have the center of the planet for origin, and are almost always rectangular coordinate systems, but vary in the directions of the coordinate axes. Oft-used planetocentric coordinate systems are the planetocentric equatorial coordinate system and the planetocentric ecliptic coordinate system.