The Earth is the 3rd planet from the Sun, and the largest of the terrestrial planets. It’s a really big planet. But how many miles around the Earth? The equatorial circumference of the Earth is 24,901.55 miles. This is how many miles the Earth is around.
But things actually get a little more complicated. The Earth isn’t a perfect sphere; it’s actually an oblate spheroid – kind of a squished ball. The Earth rotates on its axis, and the regions around its equator bulge out from the center more than the poles. But if you measure around the Earth, passing through the poles, it’s only 24,859.82 miles around. So if you wanted to fly around the Earth the quickest way, it’s faster to fly past the poles than to go around the equator.
The Earth is the largest of the terrestrial planet, but it’s not the largest planet in the Solar System – that’s Jupiter. And just for a comparison, the equatorial circumference of Jupiter is 279,118 miles. And the Sun is even bigger. The equatorial circumference of the Sun is 2,720,000 miles (109 times bigger than the Earth).
We’ve also recorded an episode of Astronomy Cast all about planet Earth. Listen here, Episode 51: Earth.
NASA Earth Fact Sheet