Professor emeritus at the Institute for Advanced Study, Freeman Dyson and his Flat Earth Models

“It is reasonable to consider the Earth as approximately uniform within a distance of a few tens of kilometers from a given point on the surface, but within this distance it is also a good approximation to consider the Earth flat. A uniform-sphere model would have no advantage over the much simpler flat-Earth model.”

Selected Papers of Freeman Dyson with Commentary by Freeman J. Dyson pg. 491-492

“We are here assuming that the flat-Earth model gives a valid description of the dynamics of earth motions in the region adjacent to the point O.”

Selected Papers of Freeman Dyson with Commentary by Freeman J. Dyson, pg. 493

(link)

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