polar arc
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Polar mount — A polar mount is a piece of equipment installed onto a telescope or satellite dish mount so that geostationary satellites can be accessed by swinging the satellite dish along a single arc . This allows one positioner to be used to point the… … Wikipedia
Polar wind — is the permanent outflow of ionization from the polar regions of the magnetosphere. [http://amsglossary.allenpress.com/glossary/browse?s=p p=43 AMS Glossary] ] Ionospheric Plasma SourceThe ‘ground state’ of the ionosphere consists of the baseline … Wikipedia
Polar stratospheric cloud — Antarctic stratospheric cloud (nacreous clouds) Abbreviation PSC Altitude 15,000–25,000 m (50,000–80,000 ft) … Wikipedia
Polar coordinate system — Points in the polar coordinate system with pole O and polar axis L. In green, the point with radial coordinate 3 and angular coordinate 60 … Wikipedia
Arc length — Determining the length of an irregular arc segment is also called rectification of a curve. Historically, many methods were used for specific curves. The advent of infinitesimal calculus led to a general formula that provides closed form… … Wikipedia
polar motion — ▪ geophysics a periodic rotation of the Earth s spin axis about a mean axis, somewhat like the wobble of a spinning top. Slight variations in latitude and longitude result from this wobble because the poles are displaced from their mean… … Universalium
Meridian arc — In geodesy, a meridian arc measurement is a highly accurate determination of the distance between two points with the same longitude. Two or more such determinations at different locations then specify the shape of the reference ellipsoid which… … Wikipedia
USCGC Polar Star (WAGB-10) — is a United States Coast Guard Heavy Icebreaker. Commissioned in 1976, the ship was built by Lockheed Shipbuilding and Construction Company of Seattle, Washington along with her sister ship, Polar Sea (WAGB 11).Homeported in Seattle, Polar Star… … Wikipedia
Circumhorizontal arc — in relation to 22° arc, Oregon A circumhorizontal arc is an optical phenomenon an ice halo formed by plate shaped ice crystals in high level cirrus clouds. The current accepted names are circumhorizon arc or lower symmetric 46° plate arc[1] The… … Wikipedia
North polar distance — Distance Dis tance, n. [F. distance, L. distantia.] 1. The space between two objects; the length of a line, especially the shortest line joining two points or things that are separate; measure of separation in place. [1913 Webster] Every particle … The Collaborative International Dictionary of English
trans|arc|tic — «trans AHRK tihk, AHR tihk; tranz », adjective. across or beyond the arctic or north polar region … Useful english dictionary
