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Gerardus Mercator’s Groundbreaking Projection
Stuff You Missed in History Class
Using a Compass to Travel Along a Rum Line
The lines of longitude on a globe are all great circles, as is the equator. A navigator following a rum line from a flat map sets a compass bearing and follows it. But following a great circle path requires continually shifting directions to move in a curve. Portuguese scholar pedronunus articulated the difference between rum lines and great circles in a treatise he wrote,. In 15 37.
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