Evening talk: Struve Geodetic Arc: Establishing the size and shape of the planet

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. The Norwegian part of the project was administered by Christopher Hansteen.

Bildet kan inneholde: fyrtårn, tårn, vardesignal.

Tartu Old Observatory, workplace and home of Struve. To the right: Kaarel Nõmmela. Photos: University of Tartu.

Registration

 

The Struve Geodetic Arc 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. It is an extraordinary example of scientific collaboration among scientists from different countries, and of collaboration between monarchs for a scientific cause. 

Among the collaboraters were Professor Christopher Hansteen of the Christiania (Oslo) Observatory. Hansteen assisted Struve for the periode of 1845-1855. Today, the Struve Arc has been inscribed in Unesco's World Heritage List. 

In this talk, Kaarel Nõmmela will give insight to this fascinating project, as well as to Struve himself. 

Speaker info

MA Kaarel Nõmmela

Curator of Educational Activities, University of Tartu, Estonia

Kaarel has a background from archaelogy and works in the Department of Education at the University of Tartu. He is currently a member of staff at the University of Tartu Museum, teaching at Struve’s own Observatory.

Program

  • Introduction: Museum manager Bjørn V. Johansen
  • Evening talk: Kaarel Nõmmela

The program is free of charge. Registration is mandatory. Regrettably the Observatory is not universally accessable, but the talk will be held on the ground floor of the building. For any questions or assistance, please contact Bjørn V. Johansen before your visit: b.v.johansen@khm.uio.no.

Welcome!

Publisert 10. okt. 2025 21:08 - Sist endret 31. okt. 2025 12:03