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Early ASTRONOMERS

Early ASTRONOMERS. Aristotle. 384 BC- 322 BC Greek Philosopher Believed in a geocentric model of the universe Earth was the center and planets revolved around it Also believed in four basic elements- earth, fire, water, and air Though a 5 th element aether made up the celestial bodies.

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Early ASTRONOMERS

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  1. Early ASTRONOMERS

  2. Aristotle • 384 BC- 322 BC • Greek Philosopher • Believed in a geocentric model of the universe • Earth was the center and planets revolved around it • Also believed in four basic elements- earth, fire, water, and air • Though a 5th element aether made up the celestial bodies

  3. Ptolemy • 90 AD-168 AD • Astronomer and Mathematician • Geocentric model of the universe • Developed tables for the rising and setting of sun, appearance of the stars

  4. Nicholas Copernicus • 1473-1543 • Polish astronomer and mathematician • First to propose a heliocentric model for the universe • The sun was at the center and Earth revolved around it

  5. Galileo • 1564-1642 • Italian Physicist • Developed the first telescope • Lead to the discovery of 4 of Jupiter’s Moons • Tracked the phases of Venus • Believed in the heliocentric theory of the Universe • Catholic church tried him in an Inquisitition

  6. Galileo • Excommunicated, but Pope John Paul in the 1980’s declared him innocent

  7. Johannes Kepler • 1571-1630 • The first to describe the Motion of Planets based on Geometry • Tides were cause by the Moon. • Kepler's first Law: The orbit of a planet about the Sun is an ellipse with the Sun's center of mass at one focus. • Kepler's second Law: A line joining a planet and the Sun sweeps out equal areas in equal intervals of time. • Kepler's third Law: The squares of the periods of the planets are proportional to the cubes of their semi-major axes.

  8. Edwin Hubble • 1889-1953 • American Astronomer and Mathematician • Discovered Galaxies beyond are own- the Milky Way • Confirmed the Doppler Shift which states the shift of the light spectra is in direct proportion to the distance from Earth

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