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People - Ancient Greece: Hypsicles
Ancient Greek mathematician and astronomer.

Hypsĭcles in Harpers Dictionary of Classical Antiquities (Ὑψικλῆς). An astronomer of Alexandria, who flourished under Ptolemy Physcon, about B.C. 146. He is considered by some to have been the author of the fourteenth book appended to Euclid's Elements, in which he discussed the regular solids. No one, however, disputes his claim to a small work entitled Περὶ τῆς τῶν Ζωδίων Ἀναφορᾶς, in which he gives a method, far from exact, of calculating the risings of each sign or portion of the ecliptic.

Hypsicles in Wikipedia Hypsicles (Ancient Greek: Ὑψικλῆς; ca. 190 BCE - ca. 120 BCE) was an ancient Greek mathematician and astronomer known for authoring On Ascensions (Ἀναφορικός) and the spurious Book XIV of Euclid's Elements. Life and work Although little is known about the life of Hypsicles, it is believed that he authored the astronomical work On Ascensions (Ἀναφορικός). In this work, Hypsicles proves a number of propositions on arithmetical progressions and uses the results to calculate approximate values for the times required for the signs of the zodiac to rise above the horizon.[1] It is thought that this is the work from which the division of the circle into 360 parts may have been adopted[2] since it divides the day into 360 parts, a division possibly suggested by Babylonian astronomy.[3] Hypsicles is more famously known for possibly writing the apocryphal Book XIV of Euclid's Elements. The spurious Book XIV may have been composed on the basis of a treatise by Apollonius. The book continues Euclid's comparison of regular solids inscribed in spheres, with the chief result being that the ratio of the surfaces of the dodecahedron and icosahedron inscribed in the same sphere is the same as the ratio of their volumes, the ratio being \sqrt{\tfrac{10}{3(5-\sqrt{5})}}.[2]

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