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The Da Vinci Notes

Da Vinci Notes 20: Shells on the Mountains and the Ashen Moon

The shells in our hills lie in pairs and in layers, and no flood of forty days put them there; and the dark part of the new moon shines with light thrown back by the earth.

Leonardo's Codex Leicester arguments that fossil shells were not carried by the Flood, and his explanation of the moon's ashen light as earthshine.

Leonardo da Vinci November 8, 2026 30 min

#Leonardo da Vinci #Da Vinci Notes #Codex Leicester #Fossils #Geology #Earthshine #Moon #History of science

The Da Vinci Notes

Da Vinci Notes 12: Water, Vortices and the Falling Jet

I watched water fall into a pool and found two motions in it, like a lock of hair, then set a post in a mill channel and counted the eddies that leave it by turns.

Leonardo studies the falling jet, compares water to hair, and draws the eddies behind a post that Kármán and Strouhal would later measure and name.

Leonardo da Vinci November 8, 2026 30 min

#Leonardo da Vinci #Da Vinci Notes #Water #Vortices #Fluid mechanics #Codex Leicester #History of science