Part 101

Eclipse, 110, 159.

Ecliptic, 86, 92, 99.

Elasticity, 41.

Elastic bodies, 28, 40. fluids, 28, 41, 118, 136.

Ellipsis, 75.

Equinox, 100, 107. precession of, 107.

Equator, 92, 99.

Essential properties, 10.

Exhalations, 13.

Extension, 10, 11.

Eye, 166, 195.

Fall of bodies, 24, 27, 31.

Figure, 10, 12.

Fluids, 118, 128. elastic, 28, 41, 118, 136. equilibrium of, 120, 122, 132. non-elastic, 119. pressure of, 121.

Flying, 40.

Focus, 176. of concave mirrors, 177. of convex mirrors, 175, 177. of a lens, 184. imaginary, 176. virtual, 176.

Force, 33. centrifugal, 49, 72, 95, 115. centripetal, 49, 72. projectile, 47, 49. of gravity, 47, 49.

Fountains, 135.

Friction, 68, 69, 135.

Frigid zone, 93.

Fulcrum, 54.

General properties of bodies, 10.

Georgium Sidus, 85.

Glass, 183. burning, 188. refraction of, 183.

Gold, 119, 126.

Gravity, 18, 23, 78, 97.

Harmony, 155.

Heat, 16, 29, 103.