![]() It is not possible for each and every one of us to redo all experiments in the history of science. Let’s keep this info handy if we encounter assertive flat-Earthers. Sabine Hossenfelder, “ Flat Earth “Science”: Wrong, but not Stupid” at Back(Re)Action So if you buy the idea that it’s only your personally collected evidence that you should accept, then it seems you cannot refute the idea that the earth is round, and so flat earthers philosophy forbids them to accept scientific fact. The problem that flat earthers have is that they cannot do most of these observations themselves. Of which there is plenty, starting with the historical evidence about how stellar constellations shift if you travel, how the length of shadows changes, to Newton’s 1/R2 force law that is the law for a sphere, not a disk, not to mention Einstein and gravitational redshift and the perihelion precession of mercury, and so on, and so forth. I want to leave aside here that, of course, you cannot strictly speaking prove any empirical fact you can only prove mathematical identities, so more precisely we should speak of seeking evidence that disfavors the hypothesis that the earth is flat.
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