Galileo Galilei cyangwe Galilee 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 ).