1. Let there be light! Introduction to Astronomy
©2016 Human Reformation Project
Let there be light! Introduction to Astronomy
The history of science involves the history of astronomy and the controversies involved in heavenly motions. ─Unknown

2. Ancient Civilizations
Such as Mesoamerican tribes, the Anasazi, the Babylonians, the Greeks, the Romans, etc.
Studied astronomy for religious and societal purposes
when to plant crops, harvest them, when to offer sacrifice, etc.
developed calendars based on relatively sophisticated astronomical observations

3. Aristotle 384-327 B.C. Greek Philosopher (Greece)
1st to suggest the Earth-centered solar system model (Geocentric).
Couldn’t explain why sometimes planets appeared to move backward, relative to other planets.
©2016 Wikipedia

4. Geo-Centric
the geocentric model where the Earth is at the center of all the celestial bodies (©2016 Wikipedia).
©2010

5. Helio-Centric
the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System (©2016 Wikipedia).
©2010