The circular shape of Earth's shadow on the Moon during a lunar eclipse led ancient Greeks to conclude what about Earth?

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Multiple Choice

The circular shape of Earth's shadow on the Moon during a lunar eclipse led ancient Greeks to conclude what about Earth?

Explanation:
The main idea is how shadows reveal shape. A sphere casts a circular shadow no matter how its orientation or the light source varies. During a lunar eclipse, Earth sits between the Sun and the Moon, and the shadow that falls on the Moon is consistently round. That consistent circular shadow can only be explained if Earth is spherical, because a flat or irregular shape would produce a shadow whose outline changes with angle. So the observed round shadow led ancient thinkers to conclude that Earth is spherical.

The main idea is how shadows reveal shape. A sphere casts a circular shadow no matter how its orientation or the light source varies. During a lunar eclipse, Earth sits between the Sun and the Moon, and the shadow that falls on the Moon is consistently round. That consistent circular shadow can only be explained if Earth is spherical, because a flat or irregular shape would produce a shadow whose outline changes with angle. So the observed round shadow led ancient thinkers to conclude that Earth is spherical.

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