Galileo Galilei ( Italian pronunciation : ( ɡaliˈlɛːo ɡaliˈlɛi ) ; 15 February 1564 - 8 January 1642 ) , often known mononymously as Galileo , was an Italian physicist , mathematician , astronomer , and philosopher who played a major role in the scientific revolution .
Galileo Galilei ( 15 February 1564 - 8 January 1642 ) was an Italian astronomer , and instrument maker .