Sacred Texts  Age of Reason  Index 
XV. Astronomy Index
  Previous  Next 
Buy this Book at

The Da Vinci Notebooks at


On instruments for observing the moon (909. 910).If you want to prove why the moon appears larger than it is, when it reaches the horizon; take a lens which is highly convex on one surface and concave on the opposite, and place the concave side next the eye, and look at the object beyond the convex surface; by this means you will have produced an exact imitation of the atmosphere included beneath the sphere of fire and outside that of water; for this atmosphere is concave on the side next the earth, and convex towards the fire.

Next: 910.