AST101H1 Lecture Notes - Lecture 6: Heliocentrism, Orbital Period, Geocentric Model

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Bryan Gaensler

Document Summary

Conclusions: the earth is the center of the universe, everything revolves in circles around it. More observations: the planets don"t follow a uniform pattern relative to the stars they appear to turn around" relative to the stars. Conclusions: the earth is the center of the universe, everything revolves in circles around it, planets move in circles within circles. Ptolemy"s model for planets: the earth is the center of the universe, everything revolves in circles around it, planets move in circles within circles, but: it wasn"t perfectly accurate. A different idea: the sun is the center of the universe, planets orbit the sun in circles, the moon orbits the earth. Heliocentric universe and planetary motion: the apparent motion of the planets are because the inner planets rotate faster than outer planets. Copernicus and the heliocentric universe (1473-1543: the sun is the center of the universe, planets orbit the sun in circles, the moon orbits the earth, but: it wasn"t perfectly accurate.