Dispelling the vagaries when people stammer about Eratosthenes

Dispelling the vagaries when people stammer about Eratosthenes

Other stuff about the same:
Eratosthenes
https://www.youtube.com/watch?v=E-YBmX5a3qM&t=3702s

How do we know the Circumference of the limit of our vision?
https://www.youtube.com/watch?v=94xP53vbPQs&t=4s

DEBATISM X Ep X11: Roohif vs. Shane St. Pierre | Curvature: Optical or Physical?https://www.youtube.com/watch?v=VKgcMOhzNO4&t=3s

https://www.youtube.com/watch?v=2qz2yJWvvxc&t=49s Circumference of the Spherical Limit of your view

What did he measure? https://www.youtube.com/watch?v=9RShOAFh8JE

The Truth about Cryptosthenes, Eratosthenes, and the circumference... of what?
https://www.youtube.com/watch?v=DY72Op537nk