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abstraction > mathematical concept > geometrical object > point > coordinate > planetocentric coordinate

planetocentric coordinate comparison table

Subject	is a kind of	has definition
coordinate	point	Quantities that provide references for locations in space and time.
planetocentric coordinate	coordinate	Coordinates for general use, where the z-axis is the mean axis of rotation; the x-axis is the intersection of the planetary equator (normal to the z-axis through the center of mass) and an arbitrary prime meridian; and the y-axis completes a right-hand coordinate system. Longitude (see longitude, celestial) of a point is measured positive to the prime meridian as defined by rotational elements. Latitude (see latitude, celestial) of a point is the angle between the planetary equator and a line to the center of mass. The radius is measured from the center of mass to the surface point.

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