@misc{Heweliusz_Jan_(1611-1687)_Johannis, author={Heweliusz, Jan (1611-1687)}, howpublished={online}, publisher={nakładem autora}, publisher={Andrzej Juliusz Müller}, language={lat}, type={starodruk}, title={Johannis Hevelii Epistolæ IV. [...]}, title={De eclipsi solis anno 1652 observata}, title={De motu lunæ libratorio}, title={De observatione deliquii solis anno 1649. habita}, title={De utriusque luminaris defectu anni 1654}, keywords={astronomia 17 w.}, }