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Hephaistios of Thebes (5th century BC) was an ancient Greek mathematician, engineer, and astronomer. He is best known for his work on the calculation of the circumference of the Earth, the theory of proportions, and the construction of the astronomical instrument known as the armillary sphere. He is also credited with inventing the gnomon, a device used to tell the time of day by casting a shadow on a sundial. He is sometimes referred to as the “Father of Geometry.” He was highly respected by his contemporaries, including Plato, who described him as “the most learned man of his time.”
Book 415 Hephaistios of Thebes Apotelesmatics Book I ➤
Apotelesmatics Book III: On Inceptions ➤
