Understanding Celestial Phenomena: Phases of the Moon, Eclipses, and Earth's Shape

1. Mars Figure 1.14

2. Phases of the Moon Figure 1.15

3. Solar eclipse Figure 1.16

4. A lunar eclipse Figure 1.17

5. How we know the earth is round Figure 1.18

6. Eratosthenes’s calculation Figure 1.19

7. Relative size of the Earth and Moon Figure 1.20

8. Relative distance of the Sun and Moon Figure 1.21

9. Stellar parallax Figure 1.22

10. Geocentric model by Eudoxus Figure 1.23

11. An epicycles Figure 1.24

12. Why we see retrograde motion Figure 1.25

13. Copernicus theory of planet’s distance Figure 1.26

14. Drawing an ellipse Figure 1.27

15. Kepler’s three laws Figure 1.28

16. Venus’ cycle of phases Figure 1.29

17. Observe motion of stars

18. Finding radius of the Earth

19. Definition of angular size

20. How angular size varies with distance

21. Linear size from angular size