From The Sun’s Perspective:

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Presentation transcript:

From The Sun’s Perspective: Aristarchus Occam’s Razor The Copernican Theory Giordano Bruno Brahe and Kepler Kepler’s 3 Laws of Planetary Motion

THE HELIOCENTRIC SYSTEM OF ARISTARCHUS We have no written record of this system by Aristarchus himself. --all his works (except the one mentioned above) were lost when the library in Alexandria was burned. Written accounts of this system are found in "The Sand Reckoner" by Archimedes (287-212 BC) and "On the Face of the Moon Disc" by Plutarch (46-120 AD). Features: 1. Planets orbit the sun, explaining retrograde motion 2. stellar parallax not seen because stars are at great distance.

William of Occam ~1200 AD OCCAM’S RAZOR—a simpler workable theory is a better one.

Giordano Bruno--burned at stake in 1590 --Universe is infinite! --Stars are suns with planets and beings on them.

Brahe’s Observatory at Uraniborg, Denmark

Geometry of the Ellipse

Planetary orbit eccentricities Mercury .206 Venus .0068 Earth .0167 Mars .0934 Jupiter .0485 Saturn .0556 Uranus .0472 Neptune .0086 Pluto .25