Professional Paper | Received: 03-1 0-201 4 | Accepted: 1 7-1 1 -201 4 French Geodetic and Scientific Expedition to Lapland Miljenko SOLARIĆ, Nikola SOLARIĆ University of Zagreb, Faculty of Geodesy, Kačićeva 26, 1 0000 Zagreb, Croatia
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[email protected] Abstract. The paper describes surveying a part of the meridian arc in Lapland (border of Sweden and Finland). The field team had great difficulty with the climate and terrain configuration. However, they managed to prove that the Earth is roughly shaped as a rotational ellipsoid and confirm theoretical assumptions on Newton and Huygens that the arc length of one meridian degree near a pole is greater than at smaller latitudes. Keywords: triangulation chain, length of baseline, astronomic observations, difference in latitudes, zenith sector, quadrant, length of meridian arc degree, Lapland, rotational ellipsoid 1 Introduction geodesist and writer. His parents sent him to study philo- sophy at the Collège de la Marche in Paris in 1714. A dispute over the Earth's shape arose at the begin- However, his mother insisted he return to Sant Malo in ning of the 18th century – is its equator flattened or are its 1717 and study music, but he soon developed an interest poles flattened? There were two sides of the argument: in mathematics. He was a cavalry officer and lived in Paris until 1722. His early interest in mathematics flourished • Newton (1642–1727) and Huygens (1629–1695) and he became respected and started working for the reached a conclusion that the Earth's poles were French Academy of Sciences in 1723.