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Earth radius (denoted as R 🜨 or R E) is the distance from the center of Earth to a point on or near its surface. 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 studio zone, also known as the thirty-mile zone ( TMZ ), is an area defined by a 30-mile (48 km) radius of "Hollywood" used by the American entertainment industry to determine employee benefits for work performed inside and outside of it. Its center has traditionally been regarded as the southeast corner [ 1] of Beverly Boulevard and La ...
Ionization of the atmosphere caused interference to radio communications even hundreds of kilometers from the test site for about 40 minutes. [55] Radioactive contamination of the experimental field with a radius of 2–3 km (1.2–1.9 mi) in the hypocenter area was no more than 1 milliroentgen / hour. The testers appeared at the explosion site ...
10-kilometre and 30-kilometre Zones. The Exclusion Zone was established on 2 May 1986 soon after the Chernobyl disaster, when a Soviet government commission headed by Nikolai Ryzhkov [ 8]: 4 decided on a "rather arbitrary" [ 6]: 161 area of a 30-kilometre (19 mi) radius from Reactor 4 as the designated evacuation area.
A map of heat flow from Earth's interior to the surface of Earth's crust, mostly along the oceanic ridges. The major heat-producing isotopes within Earth are potassium-40, uranium-238, and thorium-232. [136] At the center, the temperature may be up to 6,000 °C (10,830 °F), [137] and the pressure could reach 360 GPa (52 million psi). [138]
Earth's circumference is the distance around Earth.Measured around the equator, it is 40,075.017 km (24,901.461 mi).Measured passing through the poles, the circumference is 40,007.863 km (24,859.734 mi).
Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...
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