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| the top of the dome, the point directly above your head |
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| where the dome meets the earth |
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| the earth turns on the axis every 24/hrs.. soo that we see the stars, moon and sun rise and set like clock work |
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| what the early greeks regarded as the sky |
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| they are the projection of the earths poles onto the celestial sphere |
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| is the projection og the earths equator onto the celestial sphere |
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| believed that the earth was the center of the solar system |
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| determined the size of the spherical earth |
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| the path the sun appears to take around the celesial sphere each year |
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| divided the stars into magnitudes according to their brightness |
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| it helps us unerstand that the direction in which the earths axis points does indeed change slowly, but regularly in motion |
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| was the greatest astronomer of the roman era. his greatest contribution was a geometrical representation of the solar system that predicted the positions of the planets for any desired date and time |
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| the temporary appearent westword motion of a planet as the warth swings between it and the sun |
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| he came up witht he heliocentric model/ the reappraisal of the existing theories of planetary motion and the development of a nre sun centered model of the colar system |
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| studied motion and the actions of forces and boundries |
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| he made a continuous record of the positions of the sun, moon and planets for almost 20 years |
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| was tychos assistant that took over for him when he died.. he published all of tycho's results in the new astronomy.. and thats where we find the first two laws of planetary motion |
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| the orbit of a planet that has a somewhat flattened circle |
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| is the widest and diameter of the ellipse |
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| each planet moves about the sun in an orbit that is an ellipse, w/ the sun at one focus of the ellipse |
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| the straight line joining a planet and the sun sweeps out equal areas in space in equal intervals at one time |
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| the squares of the planets periods of the revolution are in direct proportion to the cubes of the semi- major axes of the orbits |
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