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Aristarchus of Samos, the ancient Copernicus; a history of Greek astronomy to Aristarchus, together with Aristarchus's Treatise on the sizes and distances of the sun and moon (1913)

Heath, Thomas Little, Sir, 1861-1940, Aristarchus, of Samos. On the sizes and distances of the sun and moon. English & Greek. 1913 · Oxford : Clarendon press · leaf 344

An illustration from Aristarchus of Samos, the ancient Copernicus; a history of Greek astronomy to Aristarchus, together with Aristarchus's Treatise on the sizes and distances of the sun and moon, 1913, leaf 344 — , so that the moon is smaller than the earth. Now suppose δ to be the angle subtended at the centre of the sunby the distance between the moon and the earth at the time whenthe moon appears halved, i.e. when the earth, sun, and moon form CH. Ill CONTENT OF THE TREATISE 331 a right-angled triangle… … Fig. 15. Now if λ: (= 7) is taken at 19, Aristarchuss mean value, and / 72 = 2, these formulae give»? <y 20 ^ 5 /=I9 ^ = 7 6f -7 =2-85, 5 = sin-1 — = 3°i,i,/. Tannerys object is to prove that the method of our treatise wasnot invented by Aristarchus but by Eudoxus. We know in thefirst place,…

Aristarchus, of Samos · Astronomy, Greek · Astronomers

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