Look up that evidence .
Nothing about flatness. All about spheroids:
"Jacques Cassini later continued Picard's arc (Paris meridian arc) northward to Dunkirk and southward to the Spanish border. Cassini divided the measured arc into two parts, one northward from Paris, another southward. When he computed the length of a degree from both chains, he found that the length of one degree of latitude in the northern part of the chain was shorter than that in the southern part (see illustration).
Cassini's ellipsoid; Huygens' theoretical ellipsoid
This result, if correct, meant that the earth was not a sphere, but a prolate spheroid (taller than wide)."
Jacques was Giovanni’s son.
https://en.wikipedia.org/wiki/History_of_geodesy#Europe[/quote]
Thank you for taking the time and trouble to research and point out the prolate sphere model which is based on Cassinis survey which brought the age of "enlightenment " .
Giovanni Cassini drew out a map of the known world based on his results and those of other astronomers who corroborated his findings , centred on the N pole . Drawn as a 24 foot map on the floor of the observatory at The French Academy , if I recall . Terrestial planisphere .
The first mention of prolate sphere was put forward in 1718 - after G. Cassinis death (1712) . Still researching this though .
That uniform shortening of latitude , 1/800 , shortening Northward doesn't fit the prolate model either , although I will have to check that out and stand for correction . That ratio fits the flat earth model with measurable distance to the pole star .
Guilty as charged ,I cherry pick all the real scientific experiment , done without bias - not much of that done these days .