Yeah I think they mean the latter. Satellite footage could be doctored after all, unless you're launched the satellite. It's not really that hard to estimate t

Yeah I think they mean the latter. Satellite footage could be doctored after all, unless you're launched the satellite. It's not really that hard to estimate the circumference of the earth and prove that it has to be spherical. But most methods I know of require quite a bit of driving, or friends that are far away and can take a measurement at exactly the same time. I'm not a flat earther but I do want to do my own measurement of the earth's circumference one day for fun.