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Academy of Sciences accurate control points accurate standard base adjustment computation astro-geodetic astronomic observations astronomic points Baltic Geodetic Commission Baltic Sea base line measurements Columbus determination Earth's crust ellipsoid error establish the Baltic field base line Finland Finland's Academy Finnish geodesists Finnish Geodetic Institute FINNISH GEODETIC RESEARCH Finnish triangulation geodesy geoid computed gravimetric method gravity anomaly field gravity observations Greenland Gulf of Bothnia Helsinki high accuracy invar wires isostatic equilibrium Isostatic Institute isostatic system IUGG Kalaja Kukkamaki and Honkasalo land uplift latitude leading of Dr light signal long base line Maupertuis measured arc meridian arc needed Nummela base line observation points oceans Ohio State University precise levellings Prof Professor Ilmari Bonsdorff R. A. Hirvonen relative accuracy sea level standard base lines stellar triangulation thickness of Earth's tisvaara Tornio total solar eclipse triangulation chain triangulation point Vaisala comparator vertical W. A. HEISKANEN World geodetic system Zero-order point