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Learn about the different ways to measure and define the radius of Earth, from the equatorial and polar radii to the mean, authalic and volumetric radii. Compare the values and models of Earth's surface, from the actual surface to the geoid, spheroid and sphere.
Find the equatorial radius, polar radius, and volumetric mean radius of Earth, as well as other bulk parameters, orbital elements, and atmospheric data. The standard acceleration of gravity for Earth is defined as 9.80665 m/s 2.
Jul 6, 2021 · According to NASA, Earth's radius at the equator is 3,963 miles (6,378 kilometers), while the radius at the poles is 3,950 miles (6,356 km).
Sep 29, 2020 · Learn how big is the Earth and how it compares to other planets in the Solar System. The Earth has a radius of 2.439 km and a diameter of 12.742 km, and it is the fifth largest planet in terms of mass and size.
With a radius of 3,959 miles (6,371 kilometers), Earth is the biggest of the terrestrial planets and the fifth largest planet overall.
Learn about Earth's size, distance, orbit, rotation, seasons, moon, and more from NASA. The web page does not provide the radius of Earth, but it shows a diagram of Earth's layers and structure.
1 day ago · Learn about Earth's distance from the Sun, orbit, rotation, axis, gravity, and tides. The equatorial radius of Earth is 6,378 km (3,963 miles), making it the largest of the four inner planets.
