Galileo Galilei
/ˌgælɪˈleɪəʊˌgælɪˈleɪɪ/- (1564-1642) , Italian astronomer and physicist. He discovered the constancy of a pendulum's swing, formulated the law of uniform acceleration of falling bodies, and described the parabolic trajectory of projectiles. He applied the telescope to astronomy and observed craters on the moon, sunspots, Jupiter's moons, and the phases of Venus.伽利略（1564-1642,意大利天文学家和物理学家, 他发现了钟摆摇摆的恒久性, 创立了自由落体恒定加速度的定律并描述了抛射体的抛物线轨迹; 他将望远镜用于天文学研究并观察到月球上的火山口、太阳黑点、木星卫星和金星的相位）。