lecture06spring2009 - Astronomy100Dr.Rhodes Lecture Chapter...

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Astronomy 100 - Dr. Rhodes Lecture # 6 - 1/26/2009
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Chapter 3: Gravity and the Rise of Modern Astronomy Galileo Galilei and the Telescope Galileo Galilei was born in Italy in 1564 and was a contemporary of Johannes Kepler. Like Kepler, Galileo also believed in the Copernican system. Galileo built his first telescope in 1609, shortly after hearing about telescopes being constructed in the Netherlands. Galileo was the first person we know of who used a telescope to study the sky.
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Chapter 3: Gravity and the Rise of Modern Astronomy Galileo Galilei and the Telescope Galileo made 5 important observations: 1) Mountains, valleys, and craters on the Moon. 2) Sunspots (which he used to measure the rotation rate of the Sun). 3) More stars than can be observed with the naked eye (i.e. he resolved the Milky Way). 4) The four largest moons of Jupiter, which are now known as the Galilean Moons . 5) The complete cycle of phases of Venus.
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The Idea Behind Galileo’s Use of Sunspots to Measure the Sun’s Rate Of Rotation
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Chapter 3: Gravity and the Rise of Modern Astronomy Galileo Galilei and the Telescope The Moon, the Sun, and the Stars Though Galileo’s first three observations did not disprove the geocentric theory, they did cast doubt on the the assumption of perfection in the heavens. The existence of stars too dim to be seen with the naked eye also cast doubt on the literal interpretation of some Biblical passages.
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Chapter 3: Gravity and the Rise of Modern Astronomy Galileo Galilei and the Telescope Jupiter’s Moons In 1610 Galileo discovered that Jupiter had four satellites of its own, now known as the Galilean moons of Jupiter. Jupiter and its orbiting moons contradicted the Ptolemaic notion that the Earth was the center of all things since they showed that a center of motion (i.e. Jupiter) could be in motion without leaving its moons behind.
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Chapter 3: Gravity and the Rise of Modern Astronomy Galileo Galilei and the Telescope
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