> people in the 19th century: they had to go with Newton because they couldn't measure anything beyond Newton As far as I know in 19th century there were alrea

> people in the 19th century: they had to go with Newton because they couldn't measure anything beyond Newton As far as I know in 19th century there were already the measurements and the calculations resulting from them that didn't match Newton's model. https://en.wikipedia.org/wiki/Urbain_Le_Verrier#Precession_of_Mercury https://en.wikipedia.org/wiki/Urbain_Le_Verrier#Precession_o... By the way, Le Verrier also discovered Neptune just by studying the measured movements of the known planets.