Historical chronology is the discipline that establishes the dates of events and reconstructs the calendars used in ancient, medieval, and early modern times. Traditional accounts state that Joseph Scaliger (1540-1609) created this field by combining philological with astronomical data and techniques. But the celestial phenomena most relevant to chronology are solar and lunar eclipses. From antiquity onwards, astrologers saw these as ominous and connected them to great events on earth. Though Scaliger used dated eclipses in his work, it was a (...) number of relatively obscure sixteenth-century astronomers and scholars who realized that one could date events by eclipses and began doing so in a systematic way, without assigning them any ominous force. (shrink)