The heliocentric and the geocentric models of the solar system include some central principles. One of these principles is that the speeds of the sun, moon, and stars are perfectly uniform and unchanging. A second principle is that _____? 1. the Earth is at the center of the planets and the sun 2. the sun is at the center of the Earth and the other planets 3. the orbit of a planet around the sun is an ellipse 4. the orbits of the sun, moon, and stars are perfect circles
Biology · Middle School · Mon Jan 18 2021
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4. The orbits of the sun, moon, and stars are perfect circles.
In both the geocentric (Earth-centered) and heliocentric (Sun-centered) models proposed in ancient astronomy, a common assumption was that celestial bodies moved in perfect circular orbits. However, later observations and advancements in astronomy, particularly by Johannes Kepler, revealed that planetary orbits are actually elliptical, not perfect circles.