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dly. As to whether the moon is situated in the centre of its
elements or not.
And, if it has no proper place of its own, like the earth, in the
midst of its elements, why does it not fall to the centre of our
elements? [Footnote 26: The problem here propounded by Leonardo was
not satisfactorily answered till Newton in 1682 formulated the law
of universal attraction and gravitation. Compare No. 902, lines
5
-15.]
And, if the moon is not in the centre of its own elements and yet
does not fall, it must then be lighter than any other element.
And, if the moon is lighter than the other elements why is it opaque
and not transparent?
When objects of various sizes, being placed at various distances,
look of equal size, there must be the same relative proportion in
the distances as in the magnitudes of the objects.
[Footnote: In the diagram Leonardo wrote sole at the place marked
A.]
8
93.
OF THE MOON AND WHETHER IT IS POLISHED AND SPHERICAL.
729
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