How Did People Figure Out That The Earth Was Round Without Any Technology?

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The legendary Greek philosopher Socrates first popularized the idea that the Earth was round instead of flat. He observed a lunar eclipse and realized that the shadow on the moon due to the Earth was curved, which prompted him to deduce that the Earth must be round if it were to cast a curved shadow. Additionally, the shape of the moon—a celestial body just like the Earth—is also round, which helped him conclude that all celestial bodies must be round, including our planet.

Some scientists during the same period also noted that whenever ships arrived in port, the topmost portion of the ship would be visible first, not the whole ship. If the Earth was flat, the whole ship should be visible from a distance. These types of observations helped to strengthen the theory of the round Earth.

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