___ Aristarchus, of Samos. His method was to note the would be distant from the center of this circle 9,150 The Size of the Solar System. exact time when the moon is exactly half full, and then feet, or about 1% miles. As the volumes of spheres vary as the cubes of their to measure the apparent… … 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 whole solar sys- must form a right angle with…
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