Original scientific paper
https://doi.org/10.17794/rgn.2021.3.6
ON THE DETERMINATION OF THE SOLAR ROTATION ELEMENTS i, Ω AND PERIOD USING SUNSPOT OBSERVATIONS BY RUĐER BOŠKOVIĆ IN 1777
Mirko Husak
orcid.org/0000-0002-2814-5119
; 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
orcid.org/0000-0001-7427-044X
; Geodetski fakultet Sveučilišta u Zagrebu, Fra Andrije Kačića Miošića 26, 10000 Zagreb, Croatia
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 mod ern astronomy.
Keywords
Ruđer Bošković; solar rotation elements; sunspot observations
Hrčak ID:
259509
URI
Publication date:
23.6.2021.
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