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I am sorry I can't remember the exact locations for this answer, but this is what I do recall.

There is a well in Egypt that on one day a year the light from the sun goes straight to the bottom at midday. Knowing that the sun was directly overhead at a given time was a certain piece of the formula.

At the same time, at a measured distance from the well the shadow of an obelisk was measured. This measurement will give you an angle that can be used to calculate the radius of a circle.

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13y ago

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