Subject / Started by
"Observably round"?

Started by Helios11

Moon and Moon Landing.

Started by ElTrancy « 1 2 3 »

Waves, Dimes and Elephants.

Started by AATW « 1 2 3 ... 5 »

Law of Perspective - Distance to Horizon

Started by HorstFue « 1 2 3 4 »

How thick is the Earth?

Started by kasa « 1 2 »

Meteors

Started by MagnusSuperior

Flat weather

Started by Spycrab