868

The principles of astronomical perspective.

Beyond the sun and us there is darkness and so the air appears blue.

[Footnote: Compare Vol. I, No. 301.]

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

867 * 869

XIII * XVI

Notebooks of Leonoardo da Vinci

XIV: Anatomy, Zoology and Physiology.

. . .

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

Of the nature of Sunlight.

885

Considerations as to the size of the sun.

886,

887,

888

. . .