Тhirteenth Workshop “Solar Influences on the Magnetosphere, Ionosphere and Atmosphere”, Primosko, Bulgaristan, 13 - 17 Eylül 2021, ss.74-79
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.