LIST OF ILLUSTRATIONS. 



FIG. PAGE 



The moon Frontispiece 



1. The celestial sphere 5 



2. The daily paths of circumpolar stars To face p. 8 



3. The circles of the celestial sphere 9 



4. The equator and the ecliptic 1 1 



5. The Great Bear To face p. 12 



6. The apparent path of Jupiter 16 



7. The apparent path of Mercury 17 



8-1 1. The phases of the moon 30, 31 



12. The curvature of the earth 32 



13. The method of Aristarchus for comparing the distances of 



the sun and moon ... 34 



14. The equator and the ecliptic 36 



15. The equator, the horizon, and the meridian ... 38 



16. The measurement of the earth 39 



17. The eccentric 44 



18. The position of the sun's apogee 45 



19. The epicycle and the deferent 47 



20. The eclipse method of connecting the distances of the sun 



and moon 50 



21. The increase of the longitude of a star 52 



22. The movement of the equator 53 



23. 24. The precession of the equinoxes 53, 54 



25. The earth's shadow 57 



26. The ecliptic and the moon's path ... 57 



27. The sun and moon ,. ... 58 



28. Partial eclipse of the moon 58 



29. Total eclipse of the moon 58 



30. Annular eclipse of the sun 59 



31. Parallax 6b 



32. Refraction by the atmosphere 63 



xxix 



