Struve Geodetic Arc ,Ukraine.

The Struve Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through 10 countries and over 2,820 km. These are points of a survey, carried out between 1816 and 1855 by the astronomer Friedrich Georg Wilhelm Struve, which represented the first accurate measuring of a long segment of a meridian. This helped to establish the exact size and shape of the planet and marked an important step in the development of earth sciences and topographic mapping.
I thank Olesya for all the 3 cards sent affixing so many beautiful stamps.
Date of Inscription: 2005
Ref: 1187