The Science of Education in Its Sociological And Historical Aspects volume 2
The Science of Education in Its Sociological And Historical Aspects volume 2
Otto Willmann
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The motion is no longer from the east to the west, but from the west to the east; the sun no longer rises and sets, but the earth moves towards it and then away from it; our horizon is not stationary, awaiting, as it were, the coming and passing of the stars, but is to be conceived as a disk which is joined at one end to the earth and thus moves along with it. The astronomers were so long in taking the last step in the development of their science, /. E. , in discovering the forward motion of t...he earth, solely because of the analogy of the sun and the moon. They were familiar with the moon's revolving around the earth in a month, for they observed its daily retard of 50 minutes. They were familiar, too, with the sun's annual rotation, for this they figured out from its daily retard of 4 minutes. But they did not venture to assume different causes for the motions of the sun and the moon; and thus the sun remained a satellite of the earth. But the Egyptians had pre- viously discovered the relations of the inner planets, Mercury and Venus, to the sun, and it was this relationship which finally led the astronomers to study the monthly path of the moon, the positions of the planets, especially of Venus, and the analogy of the latter planet with the earth.
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