1. Astronomy and the Renaissance

2. Warm Up Questions
CPS Questions (1-2)
Chapter 1, Lesson 2

3. Lesson Overview Copernicus and the Sun-Centered Model
Kepler’s Laws of Planetary Motion
Chapter 1, Lesson 2

4. (Note to teacher: Use “Pick a Student” button in CPS)
Quick Write
If you were Tycho, how would you have argued for the kind of observatory you wanted from the king?
(Note to teacher: Use “Pick a Student” button in CPS)
Chapter 1, Lesson 2

5. Copernicus and the Sun-Centered Model
Chapter 1, Lesson 2
© Image Select/Art Resource

6. Why Copernicus Searched for a Better Model
Ptolemy’s predictions were off
More accurate data for the Roman Catholic Church calendar
Theory of epicycles didn’t adequately explain changes in Mars’ brightness
Chapter 1, Lesson 2

7. Copernicus’ Heliocentric System
Earth, one of several planets revolving around the Sun
Plane of Earth’s equator tilted
Chapter 1, Lesson 2

8. Copernicus’ Heliocentric System, cont.
Moon revolves around Earth
Included relative distances of planets from Sun
Earth’s atmosphere simply follows Earth as it rotates
Chapter 1, Lesson 2

9. Comparing the Copernican Model With the Ptolemaic
Ptolemy
Copernicus
Accuracy of Data
Predictive Power
Simplicity
Chapter 1, Lesson 2

10. Kepler’s Laws of Planetary Motion
Tycho Brahe’s Observations
Tycho’s observations didn’t confirm the more recent Copernican model, however
If the Earth orbited the Sun, then the nearby stars would show parallax
Chapter 1, Lesson 2
© Photos.com

11. Kepler’s Laws of Planetary Motion, cont.
Tycho’s model put Earth at the center of Sun’s orbit
Other planets orbiting Sun
Wrong conclusion for a good reason
Chapter 1, Lesson 2
© Detlev van Ravenswaay/Photo Researchers, Inc.

12. Kepler’s First Law: The Significance of the Ellipse
Ellipse – a geometrical shape of which every point is same total distance from two fixed points
Each planet’s path around the Sun is an ellipse
Chapter 1, Lesson 2

13. Kepler’s Second Law: The Planets’ Changing Speeds
A planet speeds up when it is closer to the Sun, and slows down when it is farther away
Chapter 1, Lesson 2

14. How Kepler’s Third Law Implied the Force of Gravity
Kepler hypothesized that a force held the planets near the Sun—gravity
Harmonic Law: expresses a relationship between the time a planet takes to orbit the Sun and its distance from the Sun ra
Chapter 1, Lesson 2
Courtesy of National Library of Medicine

15. Learning Check CPS Questions (3-4)
Chapter 1, Lesson 2

16. Activity 1: Astronomy and The Renaissance
Use your textbook to identify the terms and people to complete the sentence or answer the question provided using complete sentences.
Chapter 1, Lesson 2

17. Activity 2: Drawing Ellipses
Tie each end of the string around a tack
Push the thumb tacks into the cardboard approximately 8 inches apart
Stretch the string taut and insert the tip of a pen/pencil into the angle of the string
Mark an ellipse on the cardboard by dragging the pen/pencil around the cardboard
Complete the worksheet together as a team
Chapter 1, Lesson 2

18. Activity 3: Your Own Ancient Observatory
Your worksheet lists some of the tools you would probably find in an observatory today
At the time of the Renaissance, these tools had not been invented yet
What tools would you use instead, since these were not available?
Chapter 1, Lesson 2

19. Technology Enrichment: The Earth’s Seasons
Watch the video clips and answer the questions on the worksheet
Write a brief script, as if for your own video, about why the Earth’s seasons change
Chapter 1, Lesson 2

20. Review
Copernicus’s Heliocentric system put Earth as just one of several planets revolving around the Sun
Tycho’s observations didn’t confirm the more recent Copernican model, however
Kepler’s First Law of Planetary Motion holds that each planet’s path around the Sun is an ellipse
Kepler’s second law tells us about a planet’s speed as it moves around the Sun
Kepler’s third law implied the force of gravity
Chapter 1, Lesson 2

21. Review Questions
CPS Questions (5-6)
Chapter 1, Lesson 2

22. Summary Copernicus and the Sun-Centered Model
Kepler’s Laws of Planetary Motion
Chapter 1, Lesson 2

23. Next…
Done – Astronomy and the Renaissance Next – The Enlightenment and Modern Astronomy
Chapter 1, Lesson 2
Courtesy of NASA