Description: US Coast and Geodetic Survey chart of the US showing great circle outlines. "They eye of the constructor is assumed to be at the center of the terrestrial globe, hence every great circle appears projected on the chart as a straight line. The meridians, being parts of great circles, appear on the chart as straight lines and the parallels as conic sections. "—Great Circle Outline Chart of the United States Map also includes military air fields, commercial and municipal airports, CAA intermediate fields, and lines of equal magnetic variation. Scale is 1:5,094,000 at the point of tangency. Key to NOAA maps.
Source: US Coast and Geodetic Survey, Great Circle Outline Charts: Aeronautical Edition (Washington, DC: US Coast and Geodetic Survey, 1941)
Map Credit: Courtesy the U.S. National Oceanic and Atmospheric Administration |
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