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)
own centre at such speed that the opening representing the sun completes one revolution about the centre of the wheel in a year, and suppose the centre of the wheel to describe the circle in the plane of the equator at uniform speed in one day. In the figure appended, & represents the earth, the… … At the winter solstice the sun is south of the equator, at the summer solstice north of it, and the diameter of the wheel corresponds to an ἈΠΕῚς at & which is double of the obliquity of the ecliptic, say 47. Now, as the diameter of the sun’s wheel is 28 times the diameter of the earth, i.e. of the…
Aristarchus, of Samos · Astronomers -- Greece -- Biography · Astronomy, Greek -- History
Internet Archive · Public domain (published before 1931). Free to use for anything.
