>>13000350Technically, sure, but if you put the sun overhead at a height equal to the radius of the earth, and assume the earth is flat and that distances traveled over the surface of the earth are equal in both models, even with a difference of 20 degrees of latitude, the difference in shadow length between the two models is only about 1 percent, which is well below “stick and ruler” type DIY measurements. Getting a larger latitude difference than that is well beyond the means of the average person, and once collaboration is required, they’ll just assume the other person did something wrong. Method of Erastothenes is a great experiment to measure the radius of the Earth if you already believe it to be round, but it’s definitely not proof of its roundness unless performed much more precisely than one would naively expect
