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Copernicus, Brahe, & Kepler (and a bit about graphs)

Copernicus, Brahe, & Kepler (and a bit about graphs). Sections 3.1-3.3. Nicholas Copernicus. 19 February 1473 – 24 May 1543 Sees that Ptolemaic system both inaccurate and overly complex. Proposes a simpler sun-centered system to explain lunar, solar, and planetary motion.

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Copernicus, Brahe, & Kepler (and a bit about graphs)

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  1. Copernicus, Brahe, & Kepler(and a bit about graphs) Sections 3.1-3.3

  2. Nicholas Copernicus • 19 February 1473 – 24 May 1543 • Sees that Ptolemaic system both inaccurate and overly complex. • Proposes a simpler sun-centered system to explain lunar, solar, and planetary motion. • Includes perfect circular motion • Retains tiny epicycles on orbits to explain irregular motions.

  3. Copernican System

  4. Tycho Brahe • 14 December 1546 – 24 October 1601 • Appreciates simplicity of Copernican system, but cannot accept Earth motion. • Copernican system seen as too Catholic in the Protestant north of Europe. • Merges systems of Ptolemy and Copernicus: • Unmoving Earth • Sun and Moon orbit Earth • Planets orbit Sun

  5. Tychonic System

  6. Johannes Kepler • December 27, 1571 – November 15, 1630 • Rejects perfect circular motion following study of Mars. • Discovers three laws: • Elliptical motion • Equal areas • period2 = distance3 • System accepted today.

  7. A bit about graphs…(in preparation for next week’s lab) • Graphs are used to find relationships between variables. • In a linear relationship, y = mx + b • Be certain to pre-read your lab manual before entering lab next week. • Optional: Read SLH – http://www.phy.ilst.edu/pte/

  8. This week’s reflection • State and explain one convincing scientific proof demonstrating the rotation of Earth. • Restrict your response to 150 words. • Submit to me at cjwennin@ilstu.edu • Due to me no later than Tuesday before class. • I will send confirmation email after class today. • Quiz #1… look for scores on Mallard after 12 p.m. on today.

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