|≈||approximately equal to|
|digits||indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …)|
Earth radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). This length is also used as a unit of distance, especially in astronomy and geology, where it is usually denoted by R⊕.
Terameter or teramatre is equal to 1E+12 (1012) meters (unit of length), comes from a combination of the metric prefix tera (T) and the SI unit of length meter (m). Plural name is terameters.