Word: aristarchus
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Dates: during 1970-1979
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...disk scientifically. They realized that their goddess was not luminous herself but shone only in the reflected light of the sun. They determined that the moon had mountains and valleys and that it always kept the same face turned toward earth. By the 3rd century B.C., the Greek philosopher Aristarchus and others had used geometry to make surprisingly accurate estimates of the moon's size, its orbit, its distance from earth. They even guessed that it was the cause of tides...