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constructed like a telescope--telescopes were first made about
600. As LIBRI pointed out (Histoire des Sciences mathematiques
1
III, 101) Fracastoro of Verona (1473-1553) succeeded in
magnifying the moon's face by an arrangement of lenses (compare No.
910, note), and this gives probability to Leonardo's invention at a
not much earlier date.
I.
THE EARTH AS A PLANET.
The earth's place in the universe (857. 858).
8
57.
The equator, the line of the horizon, the ecliptic, the meridian:
These lines are those which in all their parts are equidistant from
the centre of the globe.
8
58.
The earth is not in the centre of the Sun's orbit nor at the centre
of the universe, but in the centre of its companion elements, and
united with them. And any one standing on the moon, when it and the
sun are both beneath us, would see this our earth and the element of
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