A Tale of Two Cosmologies

• geocentric model and epicycles: animation
• heliocentric model and retrograde animation

Tycho Brahe

• nova stella discovery; present view (X-ray vision)
• precision astrometry

Johannes Kepler & Kepler's Laws

• Three laws characterize planet motion: simulations
  1. Orbits are ellipses
  2. Equal areas in equal times
  3. P² = a³
• solar system orbit visualizer
• inner solar system objects in real time

Galileo Galilei: Astronomer

• Telescope used for astronomy; not the last such repurposing
• Galileo reporting to the funding agency
• Observations
  • Moons of Jupiter
  • Venus phases: Ptolemaic vs Copernican predictions
    observed phases

Revolution I

• paradigm shift

Galileo Galilei: Physicist

• Free body motion
• Free fall ("Tower of Pisa" experiment)