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In order to explain the motion of the planets, Ptolemy combined eccentricity with an epicyclic model. The geocentric model could not fully explain these changes in the appearance of the inferior planets (the planets between the Earth and the Sun). What was Ptolemys theory? Kepler's second law says that if a planet is in an elliptical orbit around a star, then the planet moves fastest when the planet is. In order to explain the motion of the planets, Ptolemy combined eccentricity with an epicyclic model. In the Ptolemaic system each planet revolves uniformly along a circular path (epicycle), the centre of which revolves around Earth along a larger circular path (deferent). Scientists of the 1500s and 1600s inherited a model of the universe whose basic features had been defined by Aristotle 2,000 years earlier. Its behavior is shown in the figure below where the time shown is the time since your first observation. A geometry textbook gives the equation of a parabola as y=x2y=x^2y=x2, where x and y are measured in mm. Predict whether the bond, Si-O is nonpolar covalent, polar covalent, or ionic. 29. A body traveling at uniform speed on a circular path with Earth at its centre will sweep out equal angles in equal times from a terrestrial perspective. The fact that the Sun is more massive than the Earth C. Because real visible events in the sky seemed to confirm the truth of Ptolemys views, his ideas were accepted for centuries until the Polish astronomer, Copernicus, proposed in 1543 that the Sun, rather than the Earth, belonged in the center. If the Sun is located at one focus of Earth's elliptical orbit, what is at the other focus? b. weight force on a falling object, and the drag force pulling up Died: 165 CE; Alexandria, Egypt. However, the paths of the Sun, Moon, and planets as observed from Earth are not circular. Scientists of the 1500s and 1600s inherited a model of the universe whose basic features had been defined by Aristotle 2,000 years earlier. e. Mercury, Mars, and Pluto, 14.