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15 Cards in this Set
- Front
- Back
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Celestial sphere
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earliest model all the stars are attached surrounding the earth
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constellation
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formation/group of stars
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parallax
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measure the distance from a star
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retrograd motion
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planets look like they are going backwards
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geocentric model of the solar system
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earth in the center
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epicycle
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only geocentric, whose center moves uniformly around the earth
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deferent
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larger circle around the earth
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Ptolemy's model of the solar system
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Geocentric Model
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Heliocentric model of the solar system
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sun is at the center
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Copernican model of the solar system
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Heliocentric model fo the solar system
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Scientific Method
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obervation>theory>Prediction
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Refracting telescope
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Just Lens
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reflecting telescope
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using a mirror
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Kepler's three laws
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1.All planets move in elipitcal paths
2.A line from the sun to the planet sweeps out equal areas in equal times 3.The square of a planets orbital period is proportional to the cube of its semi-major axis |
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Newton's law of gravity
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calculated mass of planets
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