Determination of the Solar Rotation Elements and Period from Ru{\dj}er Bo\v{s}kovi\'c's Sunspot Observations in 1777

D. Hr\v{z}ina; D. Mari\v{c}i\'c; D. Ro\v{s}a; D. \v{S}poljari\'c; F. \v{S}terc; I. Rom\v{s}tajn; I. Skoki\'c; M. Husak; R. Braj\v{s}a

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Determination of the Solar Rotation Elements and Period from Ru{\dj}er Bo\v{s}kovi\'c's Sunspot Observations in 1777

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arxiv 2203.01898 v1 pith:YTB3F2RF submitted 2022-03-03 astro-ph.SR

D. Roša , D. Hržina , M. Husak , R. Brajša , D. Špoljarić , I. Skokić , D. Maričić , F. Šterc

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I. Romštajn

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keywords koviobservationsrotationdataelementsperiodresultssolar

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This paper focuses on the observations of sunspots made by Ru{\dj}er Bo\v{s}kovi\'c in 1777. We derived the expressions needed to calculate the elements of the Sun's rotation and period from observations. We used modern ephemeris data in the processing of the observation results. Obtained results are very similar to Bo\v{s}kovi\'c's original calculations. In addition to historical significance, they also provide scientifically valuable data on the Sun's differential rotation, which plays a significant role in generating and maintaining solar magnetic activity.

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