261
Deimos, 223
Deity, symbol of the, 87
"Demon star." See Algol
Denebola, 296
Denning, W.F., 269
Densities of sun and planets, 39
Density, 38
Deslandres, 140
Diameters of sun and planets, 31
Disappearance of moon in lunar eclipse, 65, 102–103
Disc, 60
"Disc" theory. See "Grindstone" theory
Discoveries, independent, 236
Discovery, anticipation in, 236–237;
indirect methods of, 120
"Dipper," the, 291;
the "Little," 294
Distance of a celestial body, how ascertained, 56–58;
of sun from earth, how determined, 151, 211
Distances of planets from sun, 47
Distances of sun and moon, relative, 68
Dog, the Greater. See Canis Major;
the Lesser, see Canis Minor
"Dog Star," 289, 297
Dollond, John, 115–116
Donati's Comet, 254, 257
Doppler's method, 125, 136, 282, 301–302
Dorpat, 117
Double canals of Mars, 214–215, 218–220
Double planet, earth and moon a, 189
Double stars, 300
Douglass, 233
"Dreams, Lake of," 197
Dumb-bell Nebula, 316
Earth, 20, 22, 31, 39, 48, 64, Chap. XV., 267;
cooling of, 343;
diameter of, 31;
interior of, 166;
mean distance of from sun, 47;
rigidity of, 181;
rotation of, 30, 33, 161–165, 170;
shape of, 165;
"tail" to, 182
"Earthlight," or "Earthshine," 186
Earth's axis, Precessional movement of, 175–177, 295, 298–299
Earth's shadow, circular shape of, 64, 160
Eclipse, 61
Eclipse knowledge, delay of, 74
Eclipse party, work of, 73
Eclipse of sun, advance of shadow in total, 69;
animal and plant life during, 71;
earliest record of total, 84;
description of total, 69–73;
duration of total, 69, 72;
importance of total, 68
Eclipses, ascertainment of dates of past, 74;
experience a necessity in solar, 73–74;
of moon, 63–65, Chap. IX., 203;
photography in, 93;
prediction of future, 74;
recurrence of, 74–80
Eclipses of sun, 25, 65–74, Chap. VIII., 201–202, 234;
1612 A.D., 90;
1715, 88, 91;
1724, 88, 91;
1836, 92;
1842, 92–93;
1851, 81, 93;
1868, 93;
1870, 94;
1871, 94;
1878, 95;
1882, 95;
1883, 95–96;
1893, 95–96;
1896, 96, 99;
1898, 96, 98;
1900, 97;
1905, 75–76, 80–81, 97–98;
1907, 98;
1908, 98;
1914, 99;
1927, 92, 99–100
Eclipses, Past and Future, 340
Egenitis, 272
Electric furnace, 128
Electric light, spectrum of, 122
Elements composing sun, 144–145
Ellipses, 32, 66, 172–173, 177–178
Elliptic orbit, 66, 177
Ellipticity, 32
Elongation, Eastern, 147, 149;
Western, 147, 149
Encke's Comet, 253, 256
"End of the World," 342
England, solar eclipses visible in, 87–88, 91–92
Epsilon, (ε) Lyræ, 302
Equator, 48
Equatorial telescope, 226
Equinoxes. See Precession of
Eros, 210–211, 223, 226–227;
discovery of, 24, 210, 227;
importance of, 211;
orbit of, 32, 37, 210, 336
Eruptive prominences, 139
Esclistre, 89
Ether, 322–323, 331–332
Europa, 233, 235
Evans, J.E., 219
Evening star, 149–150, 241
Everest, Mount, 200
Evershed, 182
Eye-piece, 110
Fabricius, 307
Faculæ, 136, 143
Fauth, 205
Faye, 335
Fin du Monde, 346
First quarter, 183
"Fixed stars," 280
Flagstaff, 215–216, 220
Flammarion, Camille, 346
Flamsteed, 90
"Flash spectrum," 137
"Flat," 112
Flint glass, 115
Focus, 66, 177
"Forty-foot Telescope," 115
Foster, 102
Fraunhofer, 117
French Academy of Sciences, 115
Froissart, 89
"Full moon" of Laplace, 190
Galaxy. See Milky Way.
Galilean telescope, 109
Galileo, 55, 109, 172, 197, 206, 232–235, 242
Galle, 24, 211, 244
Ganymede, 233–234
Gas light, spectrum of, 122
Gegenschein, 181–182
"Gem" of meteor ring, 271
Gemini, or the Twins (constellation), 22, 296–297
Geminorum, ζ (Zeta), 304
Geometrical groupings of stars, 292
"Giant" planet, 230, 238–239
Gibbous, 183, 185
Gill, Sir David, 211, 258, 291, 317–318
Gold, 145
Goodricke, 307
Gore, J.E., 63, 285, 303, 307–308, 310, 323–324, 331, 337, 347
Granulated structure of photosphere, 134
Gravitation (or gravity), 39, 41–45, 128, 306
Greek ideas, 18, 158, 161–162, 171, 186, 197
Green (rays of light), 121
Greenwich Observatory, 143–144, 232, 255, 303
Gregorian telescope, 113–114
Grimaldi (lunar crater), 199
"Grindstone" theory, 319–322
"Groombridge, 1830," 281–282, 326, 330
Groups of stars, 306–307
Grubb, Sir Howard, 118
Gulliver's Travels, 224
Hale, G.E., 119, 140
Half moon, 183, 185
Hall, Asaph, 223
Hall, Chester Moor, 115
Halley, Edmund, 91, 255, 264–265, 306
Halley's Comet, 255, 264–265
Haraden Hill, 91
Harvard, 118, 302
Harvest moon, 190–192
Hawaii, 221
Heat rays, 127
Heidelberg, 226, 232
Height of lunar mountains, how determined, 201
Height of objects in sky, estimation of, 196
Helium, 138, 145, 182
Helmholtz, 128, 335
Hercules (constellation), 295
Herod the Great, 101–102
Herodotus, 84
Herschel, A.S., 269
Herschel, Sir John, 92, 322
Herschel, Sir William, 22, 36, 114–115, 204, 213, 235, 283, 292, 308,
319–320, 326–328
Herschelian telescope, 114, 119
Hesper, 109
Hesperus, 150
Hevelius, 111
Hezekiah, 85
Hi, 83
Hindoos, 18
Hipparchus, 106, 177, 290, 311
Ho, 83
Holes in Milky Way, 321–323
Holmes, Oliver Wendell, 213
Homer, 223
Horace, Odes of, 106
Horizon, 159
Horizontal eclipse, 169
Horrox, 44, 151–152
Hour Glass Sea, 212
Huggins, Sir William, 94, 125, 317
Humboldt, 270
"Hunter's moon," 192
Huyghens, 111–112, 240, 242v243
Hyades, 296–297, 307
Hydrocarbon gas, 254
Hydrogen, 94, 131, 138, 140, 144, 156, 182, 254
Ibrahim ben Ahmed, 270
Ice-layer theory:
Mars, 219;
moon, 205, 219
Illusion theory of Martian canals, 219
Imbrium, Mare, 197
Inclination of orbits, 36–37
Indigo (rays of light), 121
Inferior conjunction, 147, 149
Inferior planets, 20, 22, Chap. XIV., 229
Instruments, pre-telescopic, 106–107, 172
International photographic survey of sky, 290–291
Intra-Mercurial planet, 25–26
Introduction to Astronomy, 31
Inverted view in astronomical telescope, 116–117
Io, 233–234
Iridum, Sinus, 197
Iron, 145, 254
Is Mars Habitable? 221
Jansen, 108
Janssen, 94, 236, 258
Japetus, 240
Jessenius, 89
Job, Book of, 299
Johnson, S.J., 103, 340
Josephus, 101, 262
Juno, 225
Jupiter, 20, 22–23, 31, 34, 37, 42, 227–228, 230–236, 241, 272, 311;
comet family of, 251–253, 256;
discovery of eighth satellite, 26, 232;
eclipse of, by satellite, 234;
without satellites, 234–235
Jupiter, satellites of, 26, 62, 108, 189, 232–235;
their eclipses, 234–235;
their occultations, 62, 234;
their transits, 62, 234
Kant, 334
Kapteyn, 284, 313
Keeler, 315, 337
Kelvin, Lord, 129
Kepler, 44, 152, 172, 237, 242, 245, 253, 311
Kinetic theory, 156, 202, 212, 226, 231, 239, 336
King, L.W., 84
Knowledge, 87
Labrador, 97
Lacus Somniorum, 197
"Lake of Dreams," 197
Lalande, 244, 283
Lampland, 215, 219
Langley, 95, 127
Laplace, 190, 333
Laputa, 224
Le Maire, 115
Le Verrier, 24, 236, 243–244, 275
Lead, 145
Leibnitz Mountains (lunar), 200
Leo (constellation), 270, 295–296
Leonids, 270–272, 274–275
Lescarbault, 25
Lewis, T., 303
Lexell's Comet, 250
Lick Observatory, 31, 98, 117–118, 215, 232, 303, 305, 315;
Great Telescope of, 117, 215, 237
"Life" of an eclipse of the moon, 80;
of the sun, 77–78
Life on Mars, Lowell's views, 217–218;
Pickering's, 221;
Wallace's, 221–223
Light, no extinction of, 322–324;
rays of, 127;
velocity of, 52, 235–236;
white, 121
"Light year," 53,