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        Part of Genius by Stephen Hawking
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        Where Are We? Ch. 2: Total Eclipse | Genius by Stephen Hawking

        In this clip from Genius by Stephen Hawking, three volunteers discover how far away the Moon is from Earth. Using to-scale models of the Earth and the Moon, the volunteers must firstly work out the size of the Earth and the Moon. They apply the same technique used by the ancient Greek Astronomer Aristarchus who observed you could calculate the size of both the Earth and Moon from a total eclipse. The volunteers must eclipse the real moon with a model to work out the distance.

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