Abstract: In 8 pages, the author discusses what the early Greeks knew about astronomy and how they knew this information. Many early Greeks are associated with astronomy. They include, among others, Thales, Socrates of Athens, Plato of Athens, Eudoxus of Cnidus, Aristotle, Callippus, Aristarchus of Samos Symposium, Pythagoras, Eratosthenes, and Hypatia. Free Roman Numeral sample outline is included. Bibliography lists 6 sources.