friedrich+georg+wilhelm+von+struve

=**__Friedrich Goerge__**=

The Father and Grandfather and son of the Struve familey. Friedrich was born in germany, but was known as altona in 1755. His father moved his familey from military services. They had moved to Imperial Russia. He attended the University of Tartu in Estonia, where he learned philology,but didnt find any interest in it. He soon turnd his attention to astronomy. He taught his knowledge from 1813 to 1820 at the Dorpat Observatory in Tartu. He then became the master and lead professor of the observatory.

=**__Wilhelm Contributions__**=

Most of Friedrich's work was on double stars,which many of them formed systems of two stars revolving around their common center of gravity. He measured some 3,000 binaries in his survey of more than 120,000 stars. He was also among the first to measure stellar parallax. He published his discoveries in "Catalogus novus" in 1827, "Mensurae micrometricae" in 1837, and "Positiones mediae" in1852. His observations of double stars proved that Newton’s law of gravitation also applies outside the solar system.

=**__Von Struve__**=

He was honored with the Gold Medal of the Royal Astronomical Society in 1826. The asteroid 768 Struveana named jointly in his honor and that of Otto and Karl Hermann Struve. In 1831, his published piece on geodetic surveying, Beschreibung der Breitengradmessung in den Ostseeprovinzen Russlands, discussed the Struve Geodetic Arc conception. This was a chain of survey triangulations reaching from Hammerfest in Norway to the Black Sea, through ten countries and over 2,820km. The UNESCO has appointed the chain to its List of World Heritage Sites in Europe. In 1843, he also measured the “constant of aberration.” Although Friedrich Bessel was the first to measure the parallax of a star, Struve measured the parallax of Vega.