January 21 - planets? Kepler a. Studied Brahes Data b....

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I. The 3 rd  Planet from the Sun Aristotle a. Born 384 BC ( don’t need to know for test) 2.  Ancient Astronomy – “Greek Geeks” a. Aristotle – father of western science Physics – the elements and their properties, 4 elements + properties Ancient Astronomy 1. Earth  a. 2. Astronomy – celestial objects orbit the Earth a. Held up by crystal spheres Ptolemy – Alexandrian Geographer / Astronomer a. Wrote the Alamgest b. Showed a Geocentric  c. Universe with epicycles 3. Renaissance Time >> Enlightenment a. The Geocentric Universe b. Copernicus 1473-1543 c. Proposed the Heliocentric hypothesis d. Published      De Revolutionibus in 1543 Tycho Brahe – Denmark a. 1572 – a bright new star in the sky b. 1577 – Plotted a comet’s path, no crystals in the sky. What holds up the 
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Unformatted text preview: planets? Kepler a. Studied Brahes Data b. Developed laws of planetary motion c. Keplers law a. First Law Planets move in elliptical orbits and speed up as they approach the sun. b. 2 nd law A line from the planet to the sun sweeps out equal areas in equal times c. 3 rd law -- The time a planet takes to orbit is related to its distance from the sun; it means that planet far from the sun orbit more slowly Galileo a. Telescope, b. He observed a. Spots on the sun (sun spots) b. Mountains on the moon c. The phases of Venus d. Moons orbiting Jupiter c. Book published in 1632: dialogue concerning the two chief world systems...
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January 21 - planets? Kepler a. Studied Brahes Data b....

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