Part 45

Equinoctial, the, 7. colure, 16. elevation of, 9.

Equinox, autumnal, 29. vernal, 16, 29.

Equinoxes, precession of, 31, 85.

Eta Argus, a variable star, 360, 383.

Europa, moon of Jupiter, 250.

Faculæ, solar, 177.

Fomalhaut, star in Southern Fish, 350.

Fraunhofer's lines, 164, 371.

Galaxy, the, 326.

Ganymede, moon of Jupiter, 250.

Gemini, or the Twins, 340.

Georgium Sidus, 271.

Hercules (constellation), 336. cluster in, 353. orbit of double star in, 357. solar system moving towards, 367.

Herschel, the planet (see Uranus).

Herschel's hypothesis, 392, 396.

Horizon, the, 5.

Hyades, the, 342, 350.

Hydra, or the Water-Snake, 340.

Hyperbola, the, 49.

Hyperion, moon of Saturn, 259.

Io, moon of Jupiter, 250.

Irradiation, 90, 113.

Japetus, moon of Saturn, 259.

Job's Coffin (asterism), 338.

Juno, the planet, 241.

Jupiter, apparent size of, 245. distance of, 245. great red spot of, 249. orbit of, 244. periods of, 246. physical constitution of, 246. rotation of, 248. satellites of, 250. eclipses of, 252. transits of, 254. volume of, 245. without satellites, 255.

Kant's hypothesis, 391.

Kepler, a lunar crater, 129.