>» Aristarchus, of Samos. His method was to note the would be distant from the center of this circle 9,150 Tbe Size of tbe Solar System. exact time when the moon is exactly half full, and then feet, or about Ij^ miles. to measure the apparent angle between the centers of As the volumes of spheres… … TURTLES IN THE ZOOLOGICAL GARDEN AT HAMBURG. extends to Alpha Centauri 766,000 million times the of a number of planets revolving round the sun as a is half full the earth and sun, as seen from the moon, center, and of subordinate systems of satellites revolv- volume of the sphere containing the…
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