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A geodesic is the shortest path between two points on a curved surface; in this context applies to questions where the curved surface is the earth's surface.

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Using Geodesic Measurements for Circle Radii?

home-brewing in the browser, you can get a "circle" (it will not be round on the screen due to your projection; rather approximated by a polygon w/ as many points as you care to draw), use a the direct form of geodesic
Dan S.'s user avatar
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