32 degrees, Polaris at ELP, 90 degrees, Polaris at North Pole, 0 degrees, Polaris at the equator, Motion of stars at the equator, Straight up and down, Motion of stars at the poles, horizontal, Copernicus, Sun centered model, Galileo, Father of astronomy, Ptolemy, Earth centered model, Kepler, Kepler's 3 Laws, Wanderers, Planets, Loop-de-loop motion of planets, An illusion, Accurate observations, Tycho Brahe's instruments, Foucault's pendulum, shows that the Earth is spinning

Chapter 2 introduction

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