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`Earth_"Equatorial Circ" = 40075.017 km`
40075.017
The Equatorial Circumference of the Earth is:
- 40075.017 km
- 24901.461 miles
- 21638.778 nautical miles
The circumference of the Earth depends on the great circle that is measured. If you measure the Earth’s circumference around the Equator, the circumference is the greatest at 40075.017 km. If you measure from the poles, the Earth’s polar circumference is 40007.86 km. This is because the Earth is not a perfect sphere. 
The Force of Gravity pulls the Earth into a ball, but centrifugal force from the Earth’s rotation counter acts the gravity perpendicular to the rotation of axis.
Because of this, the shape of the Earth is reasonably approximated as an oblate spheroid (see picture).