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== == Given that the circumference of the earth is 40,075.02 km (measured at the equator) the circumference in inches is roughly 1,577,756,664 inches.
Best guess for Earth Circumference is 24,900 miles (40,080 km)
by going arround the earth
The diameter of Earth at its equator is 12,756 km and its circumference is about 40,075 km.
The equatorial radius 3,396.2 kilometers (2,110miles).The equatorial circumference of Mars is 21,339 kilometers (13,259 miles).Compared to Earth, the ratio is .533, i.e. the radius and circumference of Mars is about half the radius and circumference of Earth.