Srinivasa Ramanujan (1887)

Srinivasa Ramanujan (1887) was an Indian mathematician. Extremely poor, he was largely self-taught from age 15. In 1913, he began a correspondence with English mathematician Godfrey H. Hardy that took him to England, where he made advances, especially in the theory of numbers, the partition of numbers, and the theory of continued fractions. He died of tuberculosis at age 32, generally unknown but recognized by mathematicians as a phenomenal genius.
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Gerardus Mercator (1512)

Mercator was a Flemish geographer, mathematician, and who perfected the first map using the Mercator projection, the translation of the spherical earth to a two-dimensional flat plane. In it, parallels and meridians are rendered as straight lines spaced to produce an accurate ratio of latitude to longitude at any point. It permits mariners to steer a course over long distances without continually adjusting compass readings.

What map-related term was coined by Mercator?
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