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Ch.20 The Solar System. Section 1: Observing the Solar System. Section 1. Earth at the Center Greek Observations Geocentric In a geocentric system, Earth is at the center of the revolving planets and stars Ptolemy’s Model. Section 1. Sun at the Center Heliocentric (sun centered)
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Ch.20 The Solar System Section 1: Observing the Solar System
Section 1 • Earth at the Center • Greek Observations • Geocentric • In a geocentric system, Earth is at the center of the revolving planets and stars • Ptolemy’s Model
Section 1 • Sun at the Center • Heliocentric (sun centered) • In a heliocentric system, Earth and the other planets revolve around the sun • The Copernican Revolution • Copernicus was able to work out the arrangement of the known planets and how they move around the sun
Section 1 • Sun at the Center • Galileo’s Evidence • Galileo used the newly invented telescope to make discoveries that supported the heliocentric model • Tycho Brahe’s Observations • Kepler’s Calculations • Ellipse • Kepler found that the orbit of each planet is an ellipse
Section 1 • Modern Discoveries • Today we know that the solar system consists of the sun, the planets and their moons, and several kinds of smaller objects that revolve around the sun • What six planets were known to the ancient Greeks?
