The total circumference of the equator is almost 40,000 km, with a surface area of about 510 million ^km2. The ratio of land to sea is 6 to 4 in the northern hemisphere and 8 to 2 in the southern hemisphere.
The shape of the earth is not a perfect sphere, but rather slightly collapsed from north to south. This was first discovered by Newton, who discovered the law of universal gravitation. According to precise calculations, the distance between the Earth's center and the North Pole is 6357 km, and the distance between the center and the equator is 6378 km.