Earth radius
The Earth's radius (represented as R🜨 or R E {\displaystyle R_{
 | The English used in this article or section may not be easy for everybody to understand. (May 2023) |
The Earth's radius (represented as R🜨 or ) is the distance from the center of Earth to a point on or near its surface.
Length
Earth is shaped like a slightly flattened ball (an oblate spheroid). Because it is not perfectly round, Earth's radius is different at certain places. At the Equator, Earth's radius (called the equatorial radius) is about 6,378 km (3,963 miles). At the North and South Poles, Earth's radius (called the polar radius) is a bit less at around 6,357 km (3,950 miles). The average radius has been estimated at 6,371 kilometres (3,959 mi).
| Earth radius | |
|---|---|
 Cross section of Earth's Interior | |
| General information | |
| Unit system | astronomy, geophysics |
| Unit of | distance |
| Symbol | R🜨 or , |
| Conversions | |
| 1 R🜨 in ... | ... is equal to ... |
| SI base unit | 6.3781×106 m[1] |
| Metric system | 6,357 to 6,378 km |
| English units | 3,950 to 3,963 mi |
Definitions
Earth's radius can also be defined and measured using the radius of curvature. This calculation considers land and sea topography. As a result, it can produce a different result than measurement of the equatorial or polar radiuses.
"Earth radius" is sometimes used as a unit of measurement in astronomy and geophysics. The International Astronomical Union recommends that "Earth radius" should equal the planet's equatorial radius.
References
- ↑ Mamajek, E. E; Prsa, A; Torres, G; et al. (2015). "IAU 2015 Resolution B3 on Recommended Nominal Conversion Constants for Selected Solar and Planetary Properties". arXiv:1510.07674 [astro-ph.SR].
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