Galileo Galilei cyangwe Galilée Galileo (15 Gashyantare 1564 - 24 Mutarama 1642), yahinduye igitekerezo cyari cyiganje icyo gihe cyemeza ko isi ishashe kandi idashobora kunyeganyega. Yavumbuye ko isi yibumbye, ko kandi yihindukiraho ubwayo (diurnal movement/mouvement diurne).