Abstract
Joseph Stepling was interested in determining the longitude of Prague throughout his life. He dedicated to this subject four scientific studies: two at the very beginning of his career, the third some fifteen years later, and the last just two years before his death. The original motivation to engage in this enterprise came from a call issued by the Berlin Academy of Sciences. Attempts to measure the precise longitude of Prague also accompanied the construction of the well-known astronomic tower in the Prague Clementinum, where Stepling carried out important observations of lunar eclipse. In the end, Stepling managed to measure the differences in longitude between Prague, Vienna, and Paris with admirable accuracy. His works on measuring the longitude formed the basis of a tradition which was in late eighteenth and early nineteenth century taken up by astronomers František Gerstner and especially Alois Martin David. This subject was also included in the programme of scientific exploration of Bohemia by the newly formed Royal Bohemian Society of Sciences.
Highlights
Joseph Stepling was interested in determining the longitude of Prague throughout his life
Protože je ale zeměpisná délka Klementinské věže 14° 24′ 59,46′′E (14,416498°E), podle místního středního slunečního času v Klementinu nastalo vše proti časům SEČ o 2 min a 20,04 sec dříve, čili střed byl v 0 hod 20,5 min
Na pařížské observatoři pak v roce 1748 pozoroval totéž zatmění Měsíce jako Stepling v Praze
Summary
Joseph Stepling was interested in determining the longitude of Prague throughout his life. Dubna 174814 si nejprve zavzpomínal, jak mu Stepling kdysi pomáhal v dalším matematickém vzdělávání, a pak vyjádřil své přání, aby se alespoň v Praze konala astronomická pozorování, která by bylo možné předložit berlínské akademii, když v Olomouci a Vratislavi je to pro nedostatek přístrojů nemožné.[15] Druhý list následoval 25.
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