Based off a globe, the equatorial circumference of Earth is about 24,901 miles (40,075 km). However, from pole to pole — the meridional circumference — Earth is only 24,860 miles (40,008 km) around

The diameter of the flat earth is 24,900 miles in diameter of the known world; the area which the light from the sun affects. Along the edge of our local area exists a massive 150 foot Ice Wall. The 150 foot Ice Wall is on the coast of Antarctica. It is widely known and widely studied. The Ice Wall is a massive wall of ice that surrounds Antarctica. The shelf of ice is several hundred meters thick. This nearly vertical ice front to the open sea is more than 50 meters high above the water's surface.

The longest range missle is The R-36M (SS-18 Satan) which is the world’s longest-range ICBM* with a range of 16,000km (about 9,941 miles). China claims it's missile can reach any country on earth. As to the diameter, regardless if it's globe or flat, they fall short by around 14,959 miles or around 24,074 km

*Note: ICBM = Intercontinental Ballistic Missile