- 1609: Galileo has his first observations using a telescope, discovering the moons of Jupiter, the phases of Venus, and sunspots.
- 1610: Galileo publishes "Sidereus Nuncius" describing his telescopic observations and conclusions.
- 1611: Galileo moves to Florence and becomes the chief mathematician at the University of Pisa.
- 1613: Galileo publishes "Letters on Sunspots," defending the heliocentric model of the solar system.
- 1615: Galileo travels to Rome to defend his views on heliocentrism before the Inquisition.
- 1616: The Catholic Church issues a decree forbidding the teaching of heliocentrism.
- 1623: Galileo publishes "The Assayer," a work on the nature of comets and the differences between the Copernican and Ptolemaic systems.
- 1632: Galileo publishes "Dialogue Concerning the Two Chief World Systems," comparing the Copernican and Ptolemaic systems.
- 1633: Galileo is summoned to Rome by the Inquisition and is tried for heresy. He is found guilty and sentenced to house arrest for the rest of his life.
What is Galileo's timeline of events from 1609 to 1633
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