What is an Eckert Projection?

Question

The map projection

Answer 1

Maps of the world suffer from trying to depict a sphere on a flat surface. There have been many attempts to show how a round world looks when laid flat. Most of these attempts have various kinds of distortion.

The Eckert Projection is:
"...an equal-area projection. Scale is true along the 40°30' parallels and is constant along any parallel and between any pair of parallels equidistant from the Equator. It is free of distortion only at the two points where the 40°30' parallels intersect the central meridian. This projection is not conformal or equidistant." [#1]

"The Eckert IV projection, used for world maps, is a pseudocylindrical and equal-area. The central meridian is straight, the 180th meridians are semi-circles, other meridians are elliptical. Scale is true along the parallel at 40:30 N and S.

The Eckert VI projection, used for maps of the world, is pseudocylindrical and equal area. The central meridian and all parallels are at right angles, all other meridians are sinusoidal curves. Shape distortion increases at the poles. Scale is correct at standard parallels of 49:16 North and South." [#2]

Sorry, lots of technical jargon in there. Hope this is helpful!

Answer 2

it is a divice (computers) create base on the Wallace John Eckert experiment he was an astronomer, and Director of the Thomas J. Watson Astronomical Computing Bureau at Columbia University. In January 1940, Eckert published Punched Card Methods in Scientific Computation, which solved the problem of predicting the orbits of the planets, using the IBM electric tabulating machines, based on the punch card.