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Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted b) of nearly 6,357 km (3,950 mi).
The Earth has a radius of 2.439 kilometers / 1.516 miles and a diameter of only 12.742 km / 7.917 mi. When it comes to weight, the mass of Earth is equivalent to 5.9 quadrillion kg. In the Solar System, our Earth is the fifth largest planet and the largest of the terrestrial planets.
With a radius of 3,959 miles (6,371 kilometers), Earth is the biggest of the terrestrial planets and the fifth largest planet overall.
Measured at the equator, the Earth has a circumference of 40,075.017 km or 24,901.461 miles. But measured from pole to pole, that is to say, along the meridian line, the Earth has a...
With an equatorial radius of 6,378 km (3,963 miles), Earth is the largest of the four inner, terrestrial (rocky) planets, but it is considerably smaller than the gas giants of the outer solar system. Earth has a single natural satellite, the Moon, which orbits the planet
This online calculator calculates Earth radius at given latitude using WGS 84 reference ellipsoid
The diameter of a circle is twice the radius, giving us a diameter for Earth of 12,756 km. Note: The Earth is almost, but not quite, a perfect sphere. Its equatorial radius is 6378 km, but its polar radius is 6357 km - in other words, the Earth is slightly flattened.
In the diagram above, \ ( \angle A\) is the angle that the sun’s rays arrived to Earth at Alexandria on noon of the solstice. \ ( \angle B\) represents the angle subtended at the Earth’s center by the arc representing the distance between Alexandria and Syene.
The current best estimate for the Earth’s radius is approximately 6,371 kilometers (3,959 miles). This value represents the mean radius, which is obtained by averaging measurements from various sources and considering the Earth’s oblate shape.
No one has ever ventured below Earth’s crust. Earth’s core is mostly made of iron and nickel. It consists of a solid center surrounded by an outer layer of liquid. The core is found about 2,900 kilometers (1,802 miles) below Earth’s surface, and has a radius of about 3,485 kilometers (2,165 miles).