Georg Thomas Sabler (Russian: Его́р Его́рович Са́блер or Георг Заблер, Lithuanian: Georgas Tomas Sableris; 30 April [O.S.
18 April] 1810 – 7 December 1865) was an astronomer and geodesist of Baltic German origin active in territories of modern-day Estonia, Lithuania, Ukraine, and Russia (then all part of the Russian Empire).
A student of Friedrich Georg Wilhelm von Struve, Sabler studied theology and mathematics at the University of Tartu.
Notably, Sabler participated in determining the Struve Geodetic Arc in Finland, Lithuania, Ukraine, and Bessarabia.
For his scientific aptitude, von Struve ensured that Sabler began working at the Tartu Observatory as an assistant to its director until 1839.
Actively partaking in astronomical research, Sabler was then assigned the task of measuring the exact coordinates of stars using a large meridian circle.
From 1844 to 1853, Sabler and Carl Friedrich Tenner participated in the construction of the Struve Geodetic Arc in modern-day Finland, Bessarabia, and Ukraine.
[4] In Ukraine, specifically the Khotynsky district, the scientists chose the prevailing heights of the area, which were located near the villages of Romankivtsi, Shebutyntsi, Selishche, and Hrubno.
The results of the research were published in the bulletin of the Imperial Russian Geographical Society, the journal of the Ministry of National Education, and others.
[4] After coming to Vilnius, Sabler determined the geographical position of one of the points used for measuring the Struve Geodetic Arc near the village of Nemėžis.
On 19 April 1861, Sabler participated in a meeting hosted by the St. Petersburg Academy of Sciences' physics and mathematics department in Pulkovo.