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16 Cards in this Set
- Front
- Back
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Aristotle
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determined the shape of the earth
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Aristarchus
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determined the relative size and distances of the earth,moon,and sun.
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Eratosthenes
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determined the physical size of the Earth.
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Hipparchus
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revised the observations of Aristarchus and discovered that the earth experiences recession.
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Ptolemy
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developed the geocentric model using EPICYCLES to explain retrograde motion.
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Copernicus
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developed the HELIOCENTRIC MODEL
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Tycho Brahe
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observed nightly for 25 years
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Joannes Kepler
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developed the 3 laws of planetary motion
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Galileo
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5 observations that support the heliocentric model.
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what's retrograde motion and how does it differ from normal prograde motion of planets
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retrograde motion= the apparent backward motion of planets with respect to fixed stars. (east to west)
prograde is opposite, apparent forward motion (west to east) |
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list and describe kepler's 3 laws
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1. planets orbit the sun in elliptical orbits
2. the speed of a planet varies inversely with its distance to the sun. the line from the sun to a planet sweeps equal areas in same time units. 3. a planets orbital period is related to its distance P^2 = a^3 |
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geocentric vs. heliocentric models
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geocentric, earth is in middle
heliocentric, sun is in middle geocentric, retrograde motion is explained through epicycles heliocentric, retrograde motion is explained as an optical illusion resulting from the natural orbit of the planets. |
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why are some constellations visible at night during the winter months and other constellations during the summer months?
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as the earth orbits around the sun, it's position relative to the sun and stars changes.
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what is ecliptic?
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the ecliptic is the apparent path that the sun takes among the stars.
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why is it hotter in summer than winter?
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during the summer, the earth is tilted toward the sun allowing that hemisphere to receive more direct sunlight and more hours of sunlight.
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describe the 3 independent motions that affect our perception of the motion of the planets
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1. rotation of the earth
2. orbit of the other planet around the sun 3. orbit of the earth around the sun |
