@FabulousLVNV A quick fyi. Over 2000 years ago a Greek mathematician calculated the diameter of the planet.
@FabulousLVNV It is mind-boggling but was a simple observation. It was done with sticks in the ground and measuring the angle of the suns shadow on the same day.
@BFBucky1 It’s truly mind-boggling to me how mathematics can explain so many mysterious things, especially space-related matters.