<b>A WAR IN THE HEAVENS</b>
Astronomy was considered one of the seven liberal arts (together with grammar, rhetoric, logic, music, geometry, and arithmetic), branches of learning that one needed to master before any serious study of philosophy and theology. The astrological signs of the zodiac played a significant role in the lives of medieval Christians and intellects, since the movement of the stars, planets, and other heavenly bodies were believed to have a direct impact on our own bodies, lives, and souls. Most importantly, the lunar cycle determined the date of Easter, the most important feast in the Christian calendar. The bright lights of the cosmos merged with human lives through the form of angels, beings of light who intervened in human affairs. But some angels fell from grace, following Lucifer (or Satan) and therefore became demons.