Monetae cudendae ratio is a paper on coinage by which 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?
Monetae cudendae ratio Monetae cudendae ratio (also spelled Monetæ cudendæ ratio; English: On the Minting of Coin or On the Striking of Coin; sometimes, Treatise on Money) is a paper on coinage by Nicolaus Copernicus (Polish: Mikołaj Kopernik). It was written in 1526 at the request of Sigismund I the Old, King of Poland, and presented to the Prussian Diet.
Letters on Sunspots " Letters on Sunspots " ("Istoria e Dimostrazioni intorno alle Macchie Solari") was a pamphlet written by Galileo Galilei in 1612 and published in Rome by the Accademia dei Lincei in 1613. In it Galileo outlined his recent observation of dark spots on the face of the sun. His claims were significant in undermining the traditional Aristotelian view that the sun was both unflawed and unmoving. The third letter contains his first clear public statement of support for Copernicus.