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Casius quadrangle
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Casius quadrangle : ウィキペディア英語版
Casius quadrangle

The Casius quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The quadrangle is located in the north central portion of Mars’ eastern hemisphere and covers 60° to 120° east longitude (240° to 300° west longitude) and 30° to 65° north latitude. The quadrangle uses a Lambert conformal conic projection at a nominal scale of 1:5,000,000 (1:5M). The Casius quadrangle is also referred to as MC-6 (Mars Chart-6).〔Davies, M.E.; Batson, R.M.; Wu, S.S.C. “Geodesy and Cartography” in Kieffer, H.H.; Jakosky, B.M.; Snyder, C.W.; Matthews, M.S., Eds. ''Mars.'' University of Arizona Press: Tucson, 1992.〕 Casius quadrangle contains part of Utopia Planitia and a small part of Terra Sabaea.
The southern and northern borders of the Casius quadrangle are approximately 3,065 km and 1,500 km wide, respectively. The north to south distance is about 2,050 km (slightly less than the length of Greenland).〔Distances calculated using NASA World Wind measuring tool. http://worldwind.arc.nasa.gov/.〕 The quadrangle covers an approximate area of 4.9 million square km, or a little over 3% of Mars’ surface area.〔Approximated by integrating latitudinal strips with area of R^2 (L1-L2)(cos(A)dA) from 30° to 65° latitude; where R = 3889 km, A is latitude, and angles expressed in radians. See: http://stackoverflow.com/questions/1340223/calculating-area-enclosed-by-arbitrary-polygon-on-earths-surface.〕
== Origin of Name==
Casius is the name of a telescopic albedo feature located at 40° N and 100° E on Mars. The feature was named for the Latin epithet for Zeus from his sanctuaries in Egypt and Syria. The name was approved by the International Astronomical Union (IAU) in 1958.〔USGS Gazetteer of Planetary Nomenclature. Mars. http://planetarynames.wr.usgs.gov/.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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