Often remembered as the ‘Father of Observational Astronomy,’ Galileo Galilei was one of the most celebrated and illustrious astronomers, mathematicians, and physicists in the history of mankind. He played a major role and was instrumental in establishing the scientific revolution. Galileo is credited for developing much of the modern concepts, which have proved to be the foundation for the present-day research on various fields. Throughout his life, Galileo greatly contributed to astronomical observatory. He bettered the telescope, which assisted him in his discoveries. He also dismissed the Aristotelian view, which was dominant in that era, and supported Copernicanism. His contribution in the field of astronomy includes the telescopic confirmation of the phases of Venus, the discovery of the four largest satellites of Jupiter, and the observation and analysis of sunspots. Furthermore, he invented an improved military compass and other instruments in the field of applied science and technology. He championed the heliocentric view and supported Copernicanism which irked the Roman Catholic Church. Nevertheless, with the dawn of the 20th century, the Church lifted the ban imposed on Galileo’s books and acclaimed him as the ‘Father of Modern Sciences.’