Word: aristarchus
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Dates: during 1930-1930
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...Visible to the naked eyes of ancients were Mercury Venus, Mars, Jupiter and Saturn. Although Aristarchus of Samos in the 3rd century B.C. had theorized that the planets revolved about the Sun, not until Nicolaus Copernicus (1473-1543) did the World cease believing that they together with the Sun and Moon, both of which were considered planets, turned around the Earth...