Table of Contents
Astronomy: Ancient Cosmology to Kepler and Galileo The Copernican Revolution
Announcements
Today
Timeline
What are the astronomical objects that dominate our lives?
What do we observe in the sky?
In the Beginning . . . Ancient Cosmology: Babylon, Egypt, ...
Example of description of the cosmos) Hesiod (8th Century B.C.)
Anaximander (6th century BC)
Classical Greece Pythagorus and followers (5th Century B.C.)
PPT Slide
What observations indicate that the earth is spherical?
Classical Greece 4th - 3rd Century B.C. (Aristotle lived 384-322 B.C.)
Measuring the earth Eratosthenes, 4th Cent. BC
How Good Was the Measurement of Eratosthenes?
Observations that give important clues
How can you show that the sun is much farther than the moon? (S>>M)
How large is the Moon? How Far?
Aristarchus’ Calculation and results
Aristarchus’ Conclusions
Measurement of distance to Moon
Summary of the Advanced Astronomy of Classical Greece
Earth Centered Model of Sun, Moon, Stars (Ptolomy)
Exercise
The Copernican Revolution
PPT Slide
Problem of the Planets
Motion of Sun, Moon, Planets along the “Zodiac”
Problem of the Planets
Problem of the Planets
Solutions??
Which Explanation is “Correct”?
Johannes Kepler (1571-1630)
PPT Slide
New Astronomy (1609)
Kepler’s First Two Laws
Kepler’s Third Law
Kepler’s Third Law
Exercise
Galileo & the Telescope
Galileo & the Telescope
Galileo & the Telescope
Galileo & the Telescope
The Copernican Revolution
Spectacular Event: Solar Eclipse
Solar Eclipses
Kepler Trivia
Mars – Earth - Sun
Mars - 2003
Summary
Next Time
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Author: R. M. Martin
Email: rmartin@uiuc.edu
Home Page: http://online.physics.uiuc.edu/courses/phys150/fall03/index.html
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