how big it is from one end to the other – varies depending on where you are measuring from. So what is the Earth’s diameter, measured one way and then the other?Thanks to improvements made in the field of astronomy by the 17th and 18th centuries  – as well as geodesy, a branch of mathematics dealing with the measurement of the Earth – scientists have learned that the Earth is not a perfect sphere. Earth's rotation period relative to the Sun—its mean solar day—is 86,400 seconds of mean solar time (86,400.0025 SI seconds).

Please refresh the page and try again.Space is part of Future US Inc, an international media group and leading digital publisher. New York, Ask a short question on any video on my channel. How long did Mars planetary dynamo take to turn off? Given that it takes less time to pass over the Arctic or Antarctica than it does to swing around the equator, sometimes this is the preferred path.We have written many interesting articles about the Earth and mountains here at Universe Today. The equatorial diameter of the Earth is 12,756 km. As a result, the latest measurements indicate that the Earth has an equatorial diameter of 12,756 km (7926 mi), and a polar diameter of In short, objects located along the equator are about 21 km further away from the center of the Earth (geocenter) than objects located at the poles. © Please deactivate your ad blocker in order to see our subscription offerReceive mail from us on behalf of our trusted partners or sponsors? The radius of Earth at the equator is 3,963 miles (6,378 kilometers), according to NASA's Using those measurements, the equatorial circumference of Earth is about 24,901 miles (40,075 km). Give it a listen, In this week's questions show, I consider what the benefits might be to humanity if we discover that we aren't alone in the Universe. However, Earth is not quite a sphere. That distinction belongs to Get breaking space news and the latest updates on rocket launches, skywatching events and more!Thank you for signing up to Space. This shape, caused by the flattening at the poles, is called an oblate spheroid.Earth's density is 5.513 grams per cubic centimeter, The total surface area of Earth is about 197 million square miles (510 million square km).

You will receive a verification email shortly.There was a problem. From this, we get a mean diameter of 12,742 km (7917.5 mi).The difference in Earth’s diameter has often been important when it comes to planning space launches, the orbits of satellites, and when circumnavigating the globe. The crew of Apollo 17 took this photograph of Earth in December 1972 while their spacecraft was traveling between the Earth and the Moon.

Earth, the third planet from the sun, is the fifth largest planet in the solar system; only the gas giants Jupiter, Saturn, Uranus and Neptune are bigger. Here’s We did an episode of Astronomy Cast just on the Earth.

The Earth is widest at the equator. In truth, it is what is known as an “oblate spheroid”, which is a sphere that experiences flattening at the poles.Because of this, the diameter of the Earth at the equator is about 43 kilometers (27 mi) larger than the pole-to-pole diameter. As a result, the latest measurements indicate that the Earth has an equatorial diameter of 12,756 km (7926 mi), and a polar diameter of 12713.6 km (7899.86 mi). This is what is known as its “mean diameter”, which in Earth’s case is the sum of its polar and equatorial diameters, which is then divided in half.

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