Nicolaus Copernicus

Nicolaus Copernicus (/koʊˈpɜːrnɪkəs, kə-/; Polish: Mikołaj Kopernik; German: Nikolaus Kopernikus; Niklas Koppernigk; 19 February 1473 – 24 May 1543) was a Renaissance- and Reformation-era mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe, likely independently of Aristarchus of Samos, who had formulated such a model some eighteen centuries earlier. Continue reading

First observation of a cell nucleus

The Scottish botanist Robert Brown made an observation of a cell nucleus in 1831, he noted the central body in the cells of the orchids of genuses Orchidaceae and Asclepiadaceae. He even called this structure the “nucleus” of the cell. Continue reading

The Occultation of a Star by the Moon

Nicolaus Copernicus (Mikolaj Kopernik), a Polish Astronomer, recorded in 1497, Continue reading