ANCIENT ASTRONOMY

4. He observed that the shadow Earth cast on the moon during a lunar eclipse was circular.
6. He developed a method for predicting lunar eclipses
8. He noted that the position of the strs were shifted in a systematic way
13. proposed that the center of the universe is the sun
14. He observed that ships disappearing over the horizon
15. He and his followers believed in a well-ordered harmonious universe based on geometry rather than experiments.

1. He was one of the first to use mathematics to challenge, question and support his observations of the stars
2. Earth's true shape
3. He said that light traveled fast but not at infinite speed
5. He suggested that the stars were fixed onto a solid transparent crystal line sphere that rotated about the earth
7. He made a compilation of 850 stars
9. He proposed that the Milky Way was composed of thousands of unresolved stars
10. He proposed that a cylindrical earth is at rest in the center of the universe
11. He computed the Earth's circumference
12. He viewed the universe as perfect and unchanging.