History of Medieval Astronomy

The prevailing cosmology throughout the Middle Ages was geocentrism, with Earth as the center of the Universe. Ptolemy published his epicycles model in Almagest in 150 CE. The medieval period of Europe is widely accepted among historians as beginning in 200 CE, after the fall of the Roman Empire, and ending in 1500. Copernicus reintroduced and expanded upon the concept of heliocentrism in Revolutionibus Orbium Celestium, published in 1543. The history of medieval astronomy, then, can be summarized as "not much happened."

HOWEVER... the parts before and after were very exciting. :) More here