Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci


The centre of the sphere of waters is the true centre of the globe
of our world, which is composed of water and earth, having the shape
of a sphere. But, if you want to find the centre of the element of
the earth, this is placed at a point equidistant from the surface of
the ocean, and not equidistant from the surface of the earth; for it
is evident that this globe of earth has nowhere any perfect
rotundity, excepting in places where the sea is, or marshes or other
still waters. And every part of the earth that rises above the water
is farther from the centre.

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