Who Is Galileo Galilei?

"A Biography on the Life of Galileo Galilei"
Galileo Galilei was an Italian astronomer, physicist, engineer, philosopher, teacher, and mathematician.(source 4) He made many improvements in his professions that he adapted. Galileo has been recognized and respected for his knowledge, and achievements in the physical, and natural world through his observations, and experiments. Galilei also exceeded in philosophy throughout his scientific and religious theories that have been explained in his books. Most important, Galileo Galilei has been an important figure in the community of astronomy, philosophy, teaching, and physics.
Background
Galileo was born on February 15, 1564 in the city of Pisa, Italy. His parents are Vincenzo Galilei and Giulia
The Aristotelian view is related to Roman Catholic religion. In 1585, Galileo Galilei left the University of Pisa, before earning his degree due to financial problems.
He had later earned a teaching position at University of Pisa in the year 1589. He had conducted experiments on physics related to the Aristotelian views. (source 1)Farther into his teaching career, he joined the University of Padua. He taught geometry, mechanics, and astronomy. He had taught there from 1592 to 1610.(source 5)
Inventions and Discoveries
Galileo Galilei had made improved versions to the telescope which was invented by Hans Lippershey. Galilei had started doing so in the years of 1609.(source 3) Then in 1610, he recorded telescopic observations for the first time about the phases of Venus. He had described the phases as variations of lighting on the surface of the planet. This was due to the planet's orbit around the sun. He was one of the first Europeans to view sunspots. He was the one who correctly observe and understand sunspots. (source
The first book that he wrote was The Operations of the Geometrical and Military Compass. This book was published in 1604. The book revealed his skills with experiments and practical technological applications. Next, he had written The Starry Messenger in March 1610. This book mentioned the facts about Earth's moon, Venus, and Jupiter. Galilei then wrote Discourse on Bodies in Water. This was introduced to the world in the year 1612 and it opposed the Aristotelian's theory which was saying that items float based on their weight with relation to water, not their flat shape. Afterwards, he had written the piece Dialogue Concerning the Two Chief World Systems in the year 1632. It was argument between three people that was caused by the topic the theory of the world. Galileo Galilei had published a book in 1638, in Holland and he called it Two New Sciences. He had written this book while under house arrest. This piece was a summary of his life's work on the science of motion and strength of materials. (source 1 word for word) The father of observational astronomy published the piece Sidereus Nuncius in 1610, which was a short astronomical essay about early observations of the Earth's moon, the Milky Way Galaxy, and various