The Peirce Quincuncial Projection

Peirce_quincuncial_projection_SW_20W

In the normal aspect, Peirce’s projection presents the Northern Hemisphere in a square; the Southern Hemisphere is split into four isosceles triangles symmetrically surrounding the first one, akin to star-like projections. In effect, the whole map is a square, inspiring Peirce to call his projection quincuncial, after the arrangement of five items in a quincunx.

Read more on Wikipedia.

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