After the link not working and control F not turning up a 'earth-curvature' link on the page, I physically scanned down until I found this near the bottom:
Has some simple experiments to do that they claim will prove the earth is a ball. Haven't tried any, but the sunset twice method sounds like it has possibilities.
Works for me. Just google “earth curvature calculator” there’s more of them
After the link not working and control F not turning up a 'earth-curvature' link on the page, I physically scanned down until I found this near the bottom:
https://www.omnicalculator.com/physics/flat-vs-round-earth
Has some simple experiments to do that they claim will prove the earth is a ball. Haven't tried any, but the sunset twice method sounds like it has possibilities.