primary great circle

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primary great circle [′prī‚mer·ē ′grāt ′sər·kəl]

(geodesy)

A great circle used as the origin of measurement of a coordinate; particularly, such a circle 90° from the poles of a system of spherical coordinates, as the equator. Also known as fundamental circle; primary circle.

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celestial equator
equatorial system

fundamental circle
galactic equator

horizon system of coordinates
latitude

parallel
primary circle

secondary great circle

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