Ptolemy was an Egyptian astronomer, geographer and mathematician of Greek ancestry. He lived from 90 to 168 AD, and was the last great astronomer before the known world’s descent into the Dark Ages. He is important for preserving the Greek astronomer Hipparchus’ star catalogue, which he included in his astronomical magnum opus, Amalgest. The Amalgest was the most important astronomical text in existence for close to fifteen hundred years after the death of Ptolemy, and because of this, its author gained a near legendary status. He also included in his work a set of tables (known almost comically as the Handy Tables), which made it much easier to calculate the positions of the planets, the sun and the moon, the rising and setting of the stars, and the dates of lunar and solar eclipses. Without Ptolemy’s preservation of Hipparchus’ work, and his own advances in the field of astronomy, much of the astronomical work done during the Renaissance and the Scientific Revolution may not have been possible.