The Round Shadow
A partly eclipsed Moon with the curve of Earth's shadow traced to its centre by compass.
Aristotle saw that the edge of Earth's shadow on the Moon is always curved, and reasoned that the Earth is a sphere.
A partly eclipsed Moon with the curve of Earth's shadow traced to its centre by compass.
Aristotle saw that the edge of Earth's shadow on the Moon is always curved, and reasoned that the Earth is a sphere.