Astronomy study guide 1

Astronomy study guide 1 - planet moved on a small circle...

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Winter solstice- north hemisphere receives the least amount of sunlight Summer solstice- north hemisphere receives the most about of sunlight Spring equinox- north hemisphere goes from being tipped away from sun and is tipped townards the sun; equal sun on both hemispheres Fall equinox- north hemisphere first starts to be tipped away from the sun; equal sun on both sides of hemisphere Local meridian- an imaginary half circle stretching from the horizon due south, through the zenith, to the horizon due north Asterisms- a pattern of starts seen in the sky which is not an official constellation; big dipper, little dipper Precession- the change in direction of the axis of a rotating object Scientific theory- a simple yet powerful model whose predications have been borne out by repeated and varied testing. Cosmic year- dinosaurs have lasted about 4 days; human have lasted about 30 seconds Erastosthenes- figured out the circumference of the earth Aristotle and Ptolemy- came up with the Ptolemaic model of how the universe; each
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Unformatted text preview: planet moved on a small circle whose center moved around earth on a larger circle Aristarchus-came up with the heliocentric model; putting the sun in the center of the universe Kepler’s laws- 1 st- planets orbit the sun in an ellipse, 2 nd- planets sweep equal areas in equal times around its orbit, 3 rd – p2 =a3 Tycho-made naked eye observations, best of his time, horrible at coming up with theories based on what he was able to see. His observations provided the data needed to improve the Copernican system Galileo- first to replicate a telescope, looked at the sun saw sun spots, finally proved the sun was the center of our solar system Retrograde motion- as earth passes a planet that planet appears to be moving backwards relative to the stars. Geocentric-the idea that the earth was the center of the universe Heliocentric-sun is the center of the universe, not the earth Celestial sphere-north and south celestial poles, ecliptic, celestial equator...
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This note was uploaded on 04/22/2008 for the course ASTRO 100 taught by Professor Cwfarriss during the Spring '08 term at Sonoma.

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