3 ms·
All you need is a yardstick and a friend with another at a different latitude so you can measure at the same time (using an accurate clock or a video call). Alt
by argiopetech 3y ago
All you need is a yardstick and a friend with another at a different latitude so you can measure at the same time (using an accurate clock or a video call). Alternatively, you could test in two locations at different times at local noon in each longitude (even works if you spread the measurements across years, as long as your dates are fairly comparable).
The ancients had an estimate (accuracy notwithstanding) for the diameter of the earth. It's not hard to suss out.
- Ancapistani 3y agoEasier to take a photo with the camera of your choice showing straight objects in frame. The vanishing point will be above the horizon. On a flat earth, the vanishing point would be on the horizon.
- argiopetech 3y agoI'm not sure, with only brief consideration, that that's easier in practice, but it's a clever idea that I'll explore further.