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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.
See also Non-line-of-sight propagation for more on impairments in propagation. It is important to take into account the curvature of the Earth for calculation of line-of-sight paths from maps, when a direct visual fix cannot be made. Designs for microwave formerly used 3 Earth radius to compute clearances along the path.
The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion. Initially, it was estimated that there may be 2 ...
Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in bidirectional traffic, of keeping to the left side and to the right side of the road, respectively. They are fundamental to traffic flow, and are sometimes called the rule of the road. [ 1 ] The terms right- and left-hand drive refer to the position of the driver and the ...
Radius is a 2017 Canadian science fiction thriller film directed and written by Caroline Labrèche and Steeve Léonard. It stars Diego Klattenhoff, Charlotte Sullivan, and Brett Donahue.
Geodesy. 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). [1] Measurement of Earth's circumference has been important to navigation since ancient times. The first known scientific ...
Isochrone map showing drive times around airports in northern Finland, created using GIS software (2011) An isochrone map in geography and urban planning is a map that depicts the area accessible from a point within a certain time threshold. [1] An isochrone (iso = equal, chrone = time) is defined as "a line drawn on a map connecting points at ...
The geographic areas of Houston are generally classified as either being inside or outside Interstate 610, colloquially called "the Loop". The Loop generally encircles the central business district and the "island cities" of West University Place (West U.), Southside Place, and a portion of Bellaire. ("Island cities" refers to the city of Houston's practice of annexing around the existing ...
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