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James A. Van Allen journal, October 1955-March 1958
Page 208
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11/30/1957 [sketch/picture/geometric diagram] [diagram and chart possibly computing detection and/or signal coverage of earth from vantage point of space object/satellite?] { Altitude of object above the Earth: R }{100miles}{200}{300}{500}{1000}{2000}{3000}{4000} ------------------------- { Geometrical short range to the horizon: S }{896miles}{1270}{1570}{2050}{2990}{4450}{5720}{6910} ------------------------- { Angle Ɵ }{12°45'}{17°47'}{21°37'}{27°22'}{37°03'}{48°20'}{55°18'}{60°11'} ------------------------- { *Fraction of Earth's surface geometrically "visible" from the object = ( (1 - cosine Ɵ) / 2 ) }{0.0124}{0.0239}{0.0352}{0.0560}{0.1010}{0.1676}{0.2154}{0.2514} ------------------------- *or fraction of Earth's surface from which the object is geometrically "visible".
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11/30/1957 [sketch/picture/geometric diagram] [diagram and chart possibly computing detection and/or signal coverage of earth from vantage point of space object/satellite?] { Altitude of object above the Earth: R }{100miles}{200}{300}{500}{1000}{2000}{3000}{4000} ------------------------- { Geometrical short range to the horizon: S }{896miles}{1270}{1570}{2050}{2990}{4450}{5720}{6910} ------------------------- { Angle Ɵ }{12°45'}{17°47'}{21°37'}{27°22'}{37°03'}{48°20'}{55°18'}{60°11'} ------------------------- { *Fraction of Earth's surface geometrically "visible" from the object = ( (1 - cosine Ɵ) / 2 ) }{0.0124}{0.0239}{0.0352}{0.0560}{0.1010}{0.1676}{0.2154}{0.2514} ------------------------- *or fraction of Earth's surface from which the object is geometrically "visible".
Van Allen Papers
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