Asked in Planet Earth
What is the circumference of the Earth?
March 09, 2018 6:56AM
The equatorial circumference of the Earth is about 40,075 km (24,901 m).
The polar circumference of the Earth is about 40,008 km (24,860 m).
Earth is not a perfect sphere, but is "flattened" at the poles. Its shape is described as an oblate spheroid. So, the Earth's circumference is about 68 km (41 m), larger around its belly than around its poles.
This difference is small enough that, were the earth shrunk down to the size of a billiard ball, it would be more perfectly round than most billiard balls.
Caveat: The numbers for circumference are always approximations because Earth's surface is irregular and constantly changing. The tidal bulging (constantly shifting) is a dynamic factor. Polar measurements vary with longitude. So these approximations can differ by a kilometer or two.