Site called Galileos telescope
http://www.britishpathe.com/video/through-galileos-telescope/query/Planet
https://en.wikipedia.org/wiki/Two_New_Sciences
http://highered.mheducation.com/sites/0073523976/student_view0/chapter23/web_links.html
Document library ??? http://www.lucidcafe.com/library/library.html http://www.lucidcafe.com/library/96feb/galileo.html
The Galileo project http://galileo.rice.edu/galileo.html
Galileo time line http://galileo.rice.edu/chron/galileo.html
1583
According to Vincenzo Viviani, Galileo's first biographer, during his student days at Pisa Galileo formulated the isochronism of the pendulum while watching the oscillations of a lamp in the cathedral of Pisa.
Galileo first studies Euclid's Elements--not at the university, but in Florence under the court mathematician Ostilio Ricci.
http://www.wilbourhall.org/pdfs/heath_euclid_ii.pdf
http://publicdomainreview.org/collections/the-first-six-books-of-the-elements-of-euclid-1847/
https://en.wikipedia.org/wiki/Euclid%27s_Elements
The Elements is still considered a masterpiece in the application of logic to mathematics. In historical context, it has proven enormously influential in many areas of science. Scientists Nicolaus Copernicus, Johannes Kepler, Galileo Galilei, and SirIsaac Newton were all influenced by the Elements, and applied their knowledge of it to their work. Mathematicians and philosophers, such as Thomas Hobbes, Baruch Spinoza, Alfred North Whitehead, and Bertrand Russell, have attempted to create their own foundational "Elements" for their respective disciplines, by adopting the axiomatized deductive structures that Euclid's work introduced.
The austere beauty of Euclidean geometry has been seen by many in western culture as a glimpse of an otherworldly system of perfection and certainty. Abraham Lincoln kept a copy of Euclid in his saddlebag, and studied it late at night by lamplight; he related that he said to himself, "You never can make a lawyer if you do not understand what demonstrate means; and I left my situation in Springfield, went home to my father's house, and stayed there till I could give any proposition in the six books of Euclid at sight".[17] Edna St. Vincent Millay wrote in her sonnet "Euclid alone has looked on Beauty bare", "O blinding hour, O holy, terrible day, When first the shaft into his vision shone Of light anatomized!". Einsteinrecalled a copy of the Elements and a magnetic compass as two gifts that had a great influence on him as a boy, referring to the Euclid as the "holy little geometry book".[18]
The success of the Elements is due primarily to its logical presentation of most of the mathematical knowledge available to Euclid. Much of the material is not original to him, although many of the proofs are his. However, Euclid's systematic development of his subject, from a small set of axioms to deep results, and the consistency of his approach throughout the Elements, encouraged its use as a textbook for about 2,000 years. The Elements still influences modern geometry books. Further, its logical axiomatic approach and rigorous proofs remain the cornerstone of mathematics.