THE STRUVE GEODETIC ARC (Norway to the Ukraine - 10 countries)
From 1816 to 1855 German-born Russian scientist Friedrich Georg Wilhelm von Struve triangulated the locations of 265 main station points along a single meridian of the earth from Norway to the Ukraine. Stretching through 10 countries for over 1,750 miles, this act of international scientific cooperation helped establish the exact size and shape of the earth.
(Image courtesy Wikimedia Commons; CTTO)
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