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Cleomedes, philosopher and teacher, delivered a series of lectures to his students on the subject of astronomy around AD 200. The importance accorded these lectures is not one based on merit but on uniqueness as it is rare to find an intact text from a Stoic teacher of this period. This book contains the first English translation of The Heavens with an introduction to Cleomedes, his work and intellectual context, and includes detailed notes and technical drawings. Bowen and Todd discuss Cleomedes' links to the doctrines and treatises of Posidonus, as well as the basic principles of astronomy and cosmology found within Cleomedes' work, for example his ideas on planetary motion, lunar eclipses and phases, and calculating the size of the sun.