On the Determination of the Solar Rotation Elements i, Ω and Period using Sunspot Observations by Ruđer Bošković in 1777

Authors

  • Mirko Husak Trakošćanska 20, 42000 Varaždin, Croatia https://orcid.org/0000-0002-2814-5119
  • Roman Brajša Geodetski fakultet Sveučilišta u Zagrebu, Opservatorij Hvar, Fra Andrije Kačića Miošića 26, 10000 Zagreb, Croatia
  • Dragan Špoljarić Geodetski fakultet Sveučilišta u Zagrebu, Fra Andrije Kačića Miošića 26, 10000 Zagreb, Croatia https://orcid.org/0000-0001-7427-044X

DOI:

https://doi.org/10.17794/rgn.2021.3.6

Keywords:

Ruđer Bošković, solar rotation elements, sunspot observations

Abstract

In September 1777, Ruđer Bošković observed sunspots for six days. Based on these measurements, he used his own methods to calculate the elements of the Sun’s rotation, the longitude of the node, the inclination of the solar equator and the period. He published a description of the methods, the method of observation and detailed instructions for calculations in the second chapter of the fifth part of the Opera in 1785. In this paper, Bošković’s original calculations and repeated calculations by his procedure are published. By analysing the input quantities, procedures, and results, the input quantities of the error, and the calculation results are discussed. The reproduction of Bošković’s calculations is successfully reproduced and we obtained very similar results. The conclusion proposes a relationship of Bošković’s research with modern astronomy.

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Published

2021-06-23

How to Cite

Husak, M., Brajša, R., & Špoljarić, D. (2021). On the Determination of the Solar Rotation Elements i, Ω and Period using Sunspot Observations by Ruđer Bošković in 1777. Rudarsko-geološko-Naftni Zbornik (The Mining-Geological-Petroleum Bulletin), 36(3). https://doi.org/10.17794/rgn.2021.3.6

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Section

Mathematics, Physics, Space Sciences