864

The fundamental laws of the solar system.

Mem.: That I must first show the distance of the sun from the earth; and, by means of a ray passing through a small hole into a dark chamber, detect its real size; and besides this, by means of the aqueous sphere calculate the size of the globe ...

Here it will be shown, that when the sun is in the meridian of our hemisphere [Footnote 10: Antipodi orientali cogli occidentali. The word Antipodes does not here bear its literal sense, but—as we may infer from the simultaneous reference to inhabitants of the North and South— is used as meaning men living at a distance of 90 degrees from the zenith of the rational horizon of each observer.], the antipodes to the East and to the West, alike, and at the same time, see the sun mirrored in their waters; and the same is equally true of the arctic and antarctic poles, if indeed they are inhabited.

Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.

Notebooks of Leonoardo da Vinci
XIV: Anatomy, Zoology and Physiology.
. . .
844,
845,
846,
847
On the circulation of the blood.
848,
849,
850
Some notes on medicine.
851,
852,
853,
854,
855,
856
The earth’s place in the universe.
857,
858
The fundamental laws of the solar system.
859,
860,
861,
862,
863,
864
How to prove that the earth is a planet.
865,
866,
867
The principles of astronomical perspective.
868,
869,
870,
871,
872,
873
On the luminosity of the Earth in the universal space.
874,
875,
876,
877,
878
The question of the true and of the apparent size of the sun.
879,
880,
881,
882,
883,
884
. . .