PERSPECTIVE.

Among objects moved from the eye at equal distance, that undergoes least diminution which at first was most remote.

When various objects are removed at equal distances farther from their original position, that which was at first the farthest from the eye will diminish least. And the proportion of the diminution will be in proportion to the relative distance of the objects from the eye before they were removed.

That is to say in the object *t* and the object *e* the proportion
of their distances from the eye *a* is quintuple. I remove each from
its place and set it farther from the eye by one of the 5 parts into
which the proposition is divided. Hence it happens that the nearest
to the eye has doubled the distance and according to the last
proposition but one of this, is diminished by the half of its whole
size; and the body *e*, by the same motion, is diminished 1/5 of its
whole size. Therefore, by that same last proposition but one, that
which is said in this last proposition is true; and this I say of
the motions of the celestial bodies which are more distant by 3500
miles when setting than when overhead, and yet do not increase or
diminish in any sensible degree.

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

. . .

Some notes on medicine.

851,

852,

853,

854,

855,

The earth’s place in the universe.

857,

The fundamental laws of the solar system.

859,

860,

861,

862,

863,

How to prove that the earth is a planet.

865,

866,

The principles of astronomical perspective.

868,

869,

870,

871,

872,

On the luminosity of the Earth in the universal space.

874,

875,

876,

877,

The question of the true and of the apparent size of the sun.

879,

880,

881,

882,

883,

Of the nature of Sunlight.

Considerations as to the size of the sun.

886,

887,

888,

889,

. . .