Answer:Based on the given search results [1], [2], [3], [5], [6], [7], [8], and [9], Aristotle hypothesized that Earth is round based on his observations of lunar eclipses. Aristotle observed that during a lunar eclipse, the Earth's shadow on the Moon always appears round, regardless of the Moon's position or phase. He reasoned that the only way this could happen is if the Earth itself is round, as the curved shape of the Earth would always cast a round shadow on the Moon. Aristotle's hypothesis was an important contribution to the understanding of the shape of the Earth and paved the way for further exploration and discovery in astronomy and geography.
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