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Aristotle BC 384-322
Nicolas Copernicus 1473-1543
Eyeball observations De Revolutionibus The Earth rotates on its axis once daily and revolves around the Sun once yearly.
Tycho Brahe (1546-1601)
Johann Kepler (1571-1630)
Kepler’s 1 st Law “ellipses”
Kepler’s 2 nd Law “equal areas in equal times”
PlanetPeriodDistanceP/DP/D 2 P 2 /D 3 Mercury0.240.390.621.600.99 Venus0.620.720.851.181.00 Earth1.00 Mars1.881.521.230.811.00 Jupiter22.214.171.1240.441.00 Saturn29.59.513.100.331.01
Kepler’s 3 rd Law “Harmonic Law”
Astronomical Unit Average Distance to Sun from the Earth 1 A.U. = 150 million km Examples: Mercury 0.4 A.U. Neptune 30 A.U.
From Aristotle to Newton
Announcements Homework 3 due Monday Test next week: Wednesday or Thursday (your choice); at SL 228 testing center; one hour time limit; no calculators;
History of Astronomy Motions of the sky caused by and controlled by gods. Big Horn Medicine Wheel Temple at Caracol.
Early Models of the Universe. Pythagoreans (500 B.C.) Believed the stars, planets, sun, and moon were attached to crystalline spheres which rotated around.
Geocentric Model Earth is center of our Solar System
Models of the solar system (Ch.29.1). 1 st model of the solar system Aristotle (300’s BC) said solar system was geocentric.
Solar System D. Crowley, Solar System To understand how ideas of the solar system have changed Monday, August 10, 2015.
Models of the Solar System. The observations that you have been making of the Sun, Moon and stars were the same observations made by early scientists.
Galileo, Tycho, and Kepler and Kepler. Galileo’s Experiments ( ) Galileo tried something new – doing experiments! Dropping balls to measure gravity.
ASTRONOMY 161 Introduction to Solar System Astronomy Class 6.
Observing the solar system
MODELS OF THE SOLAR SYSTEM. ARISTOTLE Greek philosopher ( BC) He promoted an earth centered called geocentric, model of solar system He said the.
Our Solar System A system of eight planets and many other objects that orbit our sun.
Formation of the Solar System Nebular Hypothesis – 12 billion years ago a giant nebula (cloud of gas & dust) rotated quickly, shrank, & compressed creating.
Web 1 Ancient Theories of Solar System 1.heliocentric theory 2. geocentric theory 3. Aristotle 4. Aristarchus 5. Ptolemy 6. Copernicus 7. Johannes Kepler.
Observing the Solar System Section Early Observations Greek Observations Saw star patterns in the sky travel together (Constellations)
Part 2: Motions of the Planets 1. Planets While stars move through the sky they stay in the same place in relation to each other. Ancient observers.
Observing the Solar System. Observers in Ancient Greece noticed that although the stars seemed to move, they stayed in the same position relative to one.
The Solar System Explorers. Ancient Greeks The ancient greeks noticed that the stars would move across the sky, but would stay in the same position relative.
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