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How did al-Biruni measure the size of the Earth from the top of a mountain?
A thousand years ago, a polymath climbed a hill in what is now Pakistan and used the angle of the horizon to find the radius of the planet.
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A thousand years ago, a polymath climbed a hill in what is now Pakistan and used the angle of the horizon to find the radius of the planet.
Tap to go on, or swipe →