Rhumb Line

In navigation, a rhumb line (or loxodrome) is a line crossing all meridians of longitude at the same angle, i.e. a path derived from a defined initial bearing. That is, upon taking an initial bearing, one proceeds along the same bearing, without changing the direction as measured relative to true north.

Read more about Rhumb Line:  Usage, General and Mathematical Description, Etymology and Historical Description, On The Riemann Sphere

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