Carl Sagan Explains How Ancient People Knew That The Earth Is Round

It has been a known fact that the Earth is round for more than 2,000 years.
Credit - https://www.youtube.com/watch?v=G8cbIWMv0rI

The modern, anti-science, flat earth conspiracy theory was invented in the early 19th century and promoted by a socialist, Samuel Rowbotham.
https://rumble.com/v437c6z-who-started-flat-earth-conspiracy-theories.html