This plugin draws a spherical helix, also called a loxodrome. It is a spiral curve on the surface of a sphere, which crosses all meridians of longitude at the same angle.
Conceptually, this is the path a ship would follow if it traveled around the earth without changing direction. In other words, if the ship proceeded along a course with constant bearing relative to true north, then it would trace out a spherical helix (luxodrome) as it circled the globe.
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