According to History, “He invented an improved telescope that let him observe and describe the moons of Jupiter, the rings of Saturn, the phases of Venus, sunspots and the rugged lunar surface.” This tells me that one of Galileo’s accomplishments is improving the telescope which let him discover various lunar objects. Secondly, according to People of our Everyday Life, it says, “Galileo introduced a geometric and military compass in 1597 while living in the Italian city of Padua.” This tells me that Galileo invented the geometric and military compass. Third, according to Time, it says, “He came up with the first thermometer and a pendulum clock…” This tells me that Galileo introduced the thermometer and the pendulum clock. Galileo’s accomplishments of improving the telescope, inventing the geometric and military compass, and inventing the thermometer and pendulum clock changed the