Great-circle meaning

A circle described by the intersection of the surface of a sphere with a plane passing through the center of the sphere.
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A segment of such a circle representing the shortest distance between two terrestrial points.
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Any circle described on the surface of a sphere by a plane which passes through the center of the sphere; specif., such a circle on the earth's surface: a course (great-circle course) plotted along a great circle of the earth is the shortest route between any two points on the earth's surface.
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A circle on the surface of a sphere whose plane passes through the center of the sphere. The Earth's equator is a great circle on the sphere of the globe.
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(geometry) A circle defined as the intersection of the surface of a sphere and a plane which passes through the centre of the sphere.
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A segment of such circle representing the shortest distance between two points on the surface of a sphere.
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