and the distance of the Sun from the Earth, 147, 184;
his comet, 344-352

Encke's comet, 344-352;
approach to Jupiter of, 349;
and Mercury, 349;
and the Sun, 346;
diminution in periodic time of, 351;
distance from Mercury of, 347;
disturbed by the Earth, 350,
and by Mercury, 348;
irregularities of, 347, 351;
orbit of, 346;
periodical return of, 351;
Von Asten's calculations concerning, 349-350

Energy supplying the tides, 539

Ensisheim meteorite, the, 393

Equatorial diameter, 196, 497;
telescope, 14

Eratosthenes, 89

Eros, 236

Eruptions, 197

Evening star, 109, 169

Eye, structure of the, 10

F

Faculae of the Sun, 37

Fire ball of 1869, 375

Fire balls, 374

"Fixed" stars, 503

Flamsteed, first Astronomer-Royal, 311;
his _Historia Coelestis_, 311

Focus of planetary ellipse, 137-139

Fomalhaut, 413

Fraunhofer, 478

Fraunhofer lines, 48

Fundy, Bay of, tides in, 538

G

Galileo, achievements of, 10;
and Jupiter's satellites, 267;
and Saturn's rings, 273, 274;
and the Pleiades, 418

Galle, Dr., and Neptune, 328-330

Gassendi, and the transit of Mercury, 164;
and the transit of Venus, 178;
lunar crater named after him, 90

Gauss, and the minor planet Ceres, 232

Gemini, constellation of, 303, 420

Geminids, the, 400

Geologists and the lapse of time, 453

Geometers, Oriental, 5

Geometry, cultivation by the ancients of, 6

George III. and Sir W. Herschel, 299, 306

Giant's Causeway, 407

Gill, Dr. D., 27;
and Juno, 243;
and the minor planets, 242;
and the parallax of a Centauri, 451;
and the parallax of Mars, 214

Glacial period, 518

Gravitation, law of, 122-149;
and binary stars, 437;
and precession, 497;
and the Earth's axis, 495, 497, 499;
and the parabolic path of comets, 340;
and the periodical return of comets, 343;
and the weight of the Earth, 203, 204;
illustrated by experiments, 123, 124, 127, 129-132;
its discovery aided by lunar observations, 108, 125;
its influence on the satellites, 149;
its influence on stars, 149;
its influence on tides, 149;
Le Verrier's triumphant proof of, 330;
Newton's discoveries, 125, 126, 147;
on the Moon, 96;
universality amongst the heavenly bodies, 128, 373

Great Bear, 27, 28, 241;
configuration, 410;
double star in the, 438;
positions of, 409, 411

Green, Mr., and Mars, 220

Greenwich Observatory, 26, 311