1. Ancient Astronomy
Chapter 3

2. Fig. 3.2

3. Fig. 3.3

4. Fig. 3.4

5. Fig. 3.5
Pythagorean Model

6. Fig. 3.6
Eudoxus’s Model

7. Aristotle’s argument that the earth must be a sphere
Fig. 3.7
Aristotle’s argument that the earth must be a sphere

8. Fig. 3.8

9. Aristarchus’s (310-230 B.C) Calculation
Fig. 3.9
Aristarchus’s ( B.C) Calculation
of Moon’s diameter and distance from Earth

10. Fig. 3.10
Small angle formula

11. Fig. 3.11

12. Fig. 3.12

13. Fig. 3.13

14. Eratosthenes’s (276-195 B.C) calculation of the earth’s radius
Fig. 3.14
Eratosthenes’s ( B.C)
calculation
of the earth’s radius

15. Precession of the earth’s axis (Hipparchus (134 B.C)
Fig. 3.15
Precession of the earth’s axis (Hipparchus (134 B.C)

16. Precession of the celestial equator
Fig. 3.16
Precession of the celestial equator

17. Fig. 3.17
Ptolemy’s model

18. Fig. 3.18
The Geocentric Model

19. Fig. 3.19