|
|
|
|
|
|
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⊕.
In typography, the point is the smallest unit of measure. It is used for measuring font size, leading, and other items on a printed page.