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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Diacria quadrangle ： ウィキペディア英語版 Diacria quadrangle The Diacria 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 northwestern portion of Mars’ western hemisphere and covers 180° to 240° east longitude (120° to 180° 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 Diacria quadrangle is also referred to as MC-2 (Mars Chart-2).〔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.〕 The Diacria quadrangle covers parts of Arcadia Planitia and Amazonis Planitia. The southern and northern borders of the Diacria quadrangle are approximately and wide, respectively. The north to south distance is about (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.〕 The Phoenix Lander’s landing site (68.22° N, 234.25° E) lies about 186 km north of the northeastern quarter of the Diacria quadrangle. The landscape viewed by the Phoenix lander is probably representative of a large portion of the terrain in the northern Diacria quadrangle. ==Origin of name== Diacria is the name of a telescopic albedo feature located at 48° N and 190° E on Mars. The feature was named by Greek astronomer E. M. Antoniadi in 1930 after a highland area in northern Attica, Greece. 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）』 ■ウィキペディアで「Diacria quadrangle」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.