Galileo Galilei

Facts Which at First Seem Improbable will, even on scant explanation, drop the cloak which has hidden them and stand forth in naked and simple beauty

               By: Galileo Galilei

An History Project about what Galileo did and how much he influenced us in present day.
By: Annie Kim
Period 1; Mr. Leavey

Picture of Galileo Galilei


Galileo Galilei

This is a portrait of him that was drawn by an artist Justus Sustermans.

Galileo Galilei is a scientist and a mathematics professor who upgraded telescopes. So Galileo didn't actually invent the telescope, he made stronger telescopes so that he can see outer space.

Galileo was born on February 15th, 1564 in Pisa, Italy and died in Arcetri, Italy, on January 8th, 1642, so he was about 78 years old. He improved the telescope (it was supposed to be a spyglass, but he started using the telescope for outer spaces) and also supported the Copernican theory, which supports a sun-centered solar system. Galileo was  also accused twice of heresy by the church for his beliefs, and wrote books on his ideas.

Where he was born:

Where he died:

Background/Personal Life of Galileo Galilei

  • Near the end of his lifetime, Galileo designed the first pendulum clock.
  • When he reached the age of ten, Galileo left Pisa to join his family in Florence and there he was tutored by Jacopo Borghini. Once he was old enough to be educated in a monastery, his parents sent him to the Camaldolese Monastery at Vallombrosa which is situated on a magnificent forested hillside 33 km southeast of Florence.
  • Galileo began teaching mathematics, first privately in Florence and then during 1585-86 at Siena where he held a public appointment. During the summer of 1586 he taught at Vallombrosa, and in this year he wrote his first scientific book The little balance [La Balancitta] which described Archimedes' method of finding the specific gravities (that is the relative densities) of substances using a balance.
  • In 1591 Vincenzo Galilei, Galileo's father, died and since Galileo was the eldest son he had to provide financial support for the rest of the family and in particular have the necessary financial means to provide dowries for his two younger sisters.
  • Galileo began to make a series of telescopes whose optical performance was much better than that of the Dutch instrument. His first telescope was made from available lenses and gave a magnification of about four times. To improve on this Galileo learned how to grind and polish his own lenses and by August 1609 he had an instrument with a magnification of around eight or nine. Galileo immediately saw the commercial and military applications of his telescope (which he called a perspicillum) for ships at sea.

Interesting Facts

  • Galileo Galilei was the first of the six children born to Vincenzo Galilei and Giulia Ammannati. His father was a lutenist, composer, and music theorist by profession. Ever since an early age, young Galileo learned the technicalities involved in lute and became an accomplished lutenist.
  • He aspired to take up priesthood when he grew up. However, his father desired Galileo to be in the field of medicine as it promised a secured financial future. Complying by the wishes of his father, Galileo took to studying at the University of Pisa for a degree in medical.
  • There were two incidents which led Galileo to move from being a physician to a mathematician. The first was in 1581 when Galileo first noticed that a chandelier despite swinging in large and small arcs took almost the same time to return to the first position. Amused by it, he set up two pendulums of equal length and swung them with a variation in sweep. Interestingly, both the pendulums, irrespective of their sweeps, took the same amount of time to return to the first position and synchronized with each other.
  • The second incident was a lecture of geometry which he accidentally attended. Both the incidents made Galileo realize his true calling and he finally convinced his father to allow him to study mathematics and natural philosophy.
  • Galileo was exposed to the Aristotelian view of the world during his years in Pisa. Though not entirely wrong, it was then the leading scientific theory, and the only one that was sanctioned by the Roman Catholic Church.
  • Though Galileo like any other intellectual of that age supported the Aristotelian view initially, he drifted away from the same eventually. Financial difficulties cut short Galileo‚Äôs education at the university, which he left in 1585, before earning his degree.
  • Some people infers that Galileo invented the telescope, but he didn't actually create the telescope, but "upgraded" the telescope
  • The telescope was actually supposed to be a spyglass, but Galileo used it in a different way-to look at the sky, and then it turned into telescope

Galileo's Achievements/Impacts to the world today

  1. He invented the first pendulum clock
  2. He improved the water pump more efficient design of the oars in ships' galleys
  3. He made vital observations of a branch of philosophy
  4. He proved Copernicus's theory that the Earth revolves around the sun
  5. He established the laws of falling bodies by demonstrating the laws of projectiles
  6. He developed ideas on motion which largely anticipated the laws of motion as finally established by Newton
  7. He demonstrated the laws of equilibrium and the principle of virtual velocities
  8. He identified the principle of flotation
  9. He invented a thermometer


  1. "Galileo." A&E Television Networks, n.d. Web. 13 May 2015. <>.
  2. "Galileo (1564-1642)." westerncultureglobal. N.p., n.d. Web. 13 May 2015. <>.
  3. "Galileo Galilei." National Geographics, 25 Aug. 2009. Web. 13 May 2015. <>.
  4. "Galileo Galilei." Famous Scientists. Famous Scientists, 1 Sept. 2014. Web. 13 May 2015. <>.
  5. "Galileo Galilei." U of St Andrews, Scotland, n.d. Web. 13 May 2015. <>.
  6. "Galileo Galilei." thescienceclassroom. Tangient, n.d. Web. 13 May 2015. <>.
  7. "Galileo Galilei Biography." thefamouspeople. N.p., n.d. Web. 13 May 2015. <>.
  8. Redd, Nola Taylor. "Galileo Galilei: Biography, Inventions & Other Facts." SPACE, n.d. Web. 13 May 2015. <>.
  9. Galileo Galilei: An Abbreviated Biography. tacitserendipity, 26 Sept. 2010. Web. 15 May 2015. <>.


A Quick Biography about:
Galileo Galilei

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a year ago

I like this!

a year ago

thank you!