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| Concerning the horizon. | 48 |
| A table of climates. | 59 |
| Concerning the meridian circles. | 61 |
| Concerning the Milky Way original: "lacteo circulo". | 65 |
| Concerning the five zones. | 67 |
| Concerning the celestial signs. | 74 |
| Concerning the magnitude of the world. | 301 |
| Concerning the spheres of the heavens. | 321 |
| Concerning the revolution of the celestial globes. | 330 |
| Concerning the zodiacal sphere original: "orbe signifero". | 335 |
| Concerning the torrid zone. | 341 |
| Concerning the increase of days. | 353 |
| Concerning the habitation of the entire earth. | 364 |