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About: Arc measurement     Goto   Sponge   NotDistinct   Permalink

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Arc measurement, sometimes degree measurement (German: Gradmessung), is the astrogeodetic technique of determining of the radius of Earth – more specifically, the local Earth radius of curvature of the figure of the Earth – by relating the latitude difference (sometimes also the longitude difference) and the geographic distance (arc length) surveyed between two locations on Earth's surface. The most common variant involves only astronomical latitudes and the meridian arc length and is called meridian arc measurement; other variants may involve only astronomical longitude (parallel arc measurement) or both geographic coordinates (oblique arc measurement).Arc measurement campaigns in Europe were the precursors to the International Association of Geodesy (IAG).