Why the sun's image on water grows with distance from the eye
Images from separated stretches of water all reach the eye; a note to define the days of earth and moon
Leonardo states that every image of the sun grows as it recedes from the eye that sees it, and that even when stretches of water are separated their images all still run to the eye. The page is filled with diagrams of waves and stretches of sea struck by the sun's rays, with lettered points and repeated sun and eye labels tracing the reflected images. A closing memorandum directs him to define the earth with its longer and shorter day in the north and the south, and to do the same for the moon and establish them truthfully.
On this page
The sun's image grows as it recedes from the eye
Every image of the sun grows as it moves away from the eye that sees it. The proposition heads the page and governs the diagrams of waves and sea struck by rays below.
Images from separated stretches of water all reach the eye
In the diagram of a stretch of sea, though the waters are separated, their images all run to the eye. The sun c and lettered points a, b, d trace the reflected images.
Memorandum: define the longer and shorter day of earth and moon
Define the earth with its longer and shorter day in the north and in the south. Do the same for the moon, and determine them with truth.