Achromatic telescope, 115, 116

Adams, 24, 236, 243

Aerial telescopes, 110, 111

Agathocles, Eclipse of, 85

Agrippa, Camillus, 44

Ahaz, dial of, 85

Air, 166

Airy, Sir G.B., 92

Al gûl, 307

Al Sufi, 284, 290, 296, 315

Alcor, 294

Alcyone, 284

Aldebaran, 103, 288, 290, 297

Algol, 307, 309–310, 312, 323, 347

Alpha, Centauri, 52–53, 280, 298–299, 304, 320

Alpha Crucis, 298

Alps, Lunar, 200

Altair, 295

Altitude of objects in sky, 196

Aluminium, 145

Amos viii. 9, 85

Anderson, T.D., 311–312

Andromeda (constellation), 279, 314;
Great Nebula in, 314, 316

Andromedid meteors, 272

Anglo-Saxon Chronicle, 87–88

Anighito meteorite, 277

Annular eclipse, 65–68, 80, 92, 99

Annular Nebula in Lyra, 315–316

Annulus, 68

Ansæ, 242–243

Anticipation in discovery, 236–237

Apennines, Lunar, 200

Aphelion, 274

Apparent enlargement of celestial objects, 192–196

Apparent size of celestial objects deceptive, 196, 294

Apparent sizes of sun and moon, variations in, 67, 80, 178

Aquila (constellation), 295

Arabian astronomers, 107, 307

Arago, 92, 257

Arc, degrees minutes and seconds of, 60

Arcturus, 280, 282, 290, 295

Argelander, 290

Argo (constellation), 298

Aristarchus of Samos, 171

Aristarchus (lunar crater), 205

Aristophanes, 101

Aristotle, 161, 173, 185

Arrhenius 222, 253–254

Assyrian tablet, 84

Asteroidal zone, analogy of, to Saturn's rings, 238

Asteroids (or minor planets), 30–31, 225–228, 336;
discovery of the, 23, 244;
Wolf's method of discovering, 226–227

Astrology, 56

Astronomical Essays, 63, 337

Astronomical Society, Royal, 144

Astronomy, Manual of, 166

Atlantic Ocean, parallelism of opposite shores, 340–341

Atlas, the Titan, 18

Atmosphere, absorption by earth's, 129–130;
ascertainment of, by spectroscope, 124–125, 212;
height of earth's, 167, 267;
of asteroids, 226;
of earth, 129, 130, 166–169, 218, 222, 267, 346;
of Mars, 156, 212, 216;
of Mercury, 156;
of moon, 70–71, 156, 201–203;
of Jupiter, 231;
of planets, 125;
of Saturn's rings, 239

"Atmosphere" of the stars, 331

Atmospheric layer and "glass-house" compared, 167, 203

August Meteors (Perseids), 270

Auriga (constellation), 294–296, 306, 311;
New Star in, 311

Aurigæ, β (Beta), 294, 297, 304

Aurora Borealis, 141, 143, 259

Australia, suggested origin of, 340

Axis, 29–30;
of earth, 163, 180;
small movement of earth's, 180–181


Babylonian tablet, 84

Babylonian idea of the moon, 185

Bacon, Roger, 108

Bacubirito meteorite, 277

Bagdad, 107

Baily, Francis, 92

"Baily's Beads," 69, 70, 91–92, 154

Bailly (lunar crater), 199

Ball, Sir Robert, 271

Barnard, E.E., 31, 224, 232–234, 237, 258

"Bay of Rainbows," 197

Bayer's classification of stars, 289, 291–292

Bayeux Tapestry, 263

Bear, Great (constellation). See Ursa Major;
Little, see Ursa Minor

Beehive (Præsepe), 307

Beer, 206

Belopolsky, 304

"Belt" of Orion, 297

Belt theory of Milky Way, 321

Belts of Jupiter, 230

Bergstrand, 314

Berlin star chart, 244

Bessel, 173, 280, 305

Beta (β) Lyræ, 307

Beta (β) Persei. See Algol

Betelgeux, 297

Bible, eclipses in, 85

Biela's Comet, 256–257, 272–273, 345

Bielids, 270, 272–273

Billion, 51–52

Binary stars, spectroscopic, 301–306, 309;
visual, 300, 303–306

"Black Drop," 152–154

"Black Hour," 89

"Black Saturday," 89

Blood, moon in eclipse like, 102

Blue (rays of light), 121, 130

Bode's Law, 22–23, 244–245

Bolometer, 127

Bond, G.P., 236, 257

Bonpland, 270

Boötes (constellation), 295, 314

Bradley, 111

Brahe, Tycho, 290, 311

Brédikhine's theory of comets' tails, 253–254, 256

Bright eclipses of moon, 65, 102

British Association for the Advancement of Science, 318

British Astronomical Association, Journal of, 194

British Museum, 84

Bull (constellation). See Taurus;
"Eye" of the, 297;
"Head" of the, 297

Burgos, 98

Busch, 93


Cæsar, Julius, 85, 110, 180, 259, 262, 291, 293

Calcium, 138, 145

Callisto, 233–234

Cambridge, 24, 91, 119, 243

Campbell, 305

Canali, 214

"Canals" of Mars, 214–222, 224–225

Cancer (constellation), 307

Canes Venatici (constellation), 306, 314

Canis Major (constellation), 289, 296–297;
Minor, 296–297

Canopus, 285, 298–299, 320

Capella, 280, 282, 290, 294, 297, 303, 313

Carbon, 145

Carbon dioxide. See Carbonic acid gas

Carbonic acid gas, 166, 213, 221–222

Carnegie Institution, Solar Observatory of, 118

Cassegrainian telescope, 114, 118

Cassini, J.D., 236, 240

"Cassini's Division" in Saturn's ring, 236, 238

Cassiopeia (constellation), 279, 294, 311, 314

Cassiopeiæ, η (Eta), 303

Cassiopeia's Chair, 294

Cassius, Dion, 86

Castor, 282, 297, 304

Catalogues of stars, 106, 290–291, 311

Centaur. See Centaurus

Centaurus (constellation), 298, 306

Centre of gravity, 42, 283–284, 324

Ceres, diameter of, 30, 225

Ceti, Omicron (or Mira), 307–308

Cetus, or the Whale (constellation), 307

Chaldean astronomers, 74, 76

Challis, 243–244

Chamberlin, 337

"Chambers of the South," 299

Chandler, 308

Charles V., 261

"Charles' Wain," 291

Chemical rays, 127

Chinese and eclipses, 83

Chloride of sodium, 122

Chlorine, 122, 145

Christ, Birth of, 102

Christian Era, first recorded solar eclipse in, 85

Chromatic aberration, 110

Chromosphere, 71–72, 93–94, 130–132, 138–139

Circle, 171–173

Clark, Alvan, & Sons, 117–118, 303

Claudius, Emperor, 86

Clavius (lunar crater), 199

Clerk Maxwell, 237

"Clouds" (of Aristophanes), 101

Clustering power, 325

Clusters of stars, 300, 306, 314, 328

Coal Sacks. See Holes in Milky Way

Cœlostat, 119

Coggia's Comet, 254

Colour, production of, in telescopes, 109–111, 115, 121

Collision of comet with earth, 345–346;
of dark star with sun, 346–348;
of stars, 285, 312

Columbus, 103

Coma Berenices (constellation), 307, 316

Comet, first discovery of by photography, 258;
first orbit calculated, 255;
first photograph of, 257–258;
furthest distance seen, 258;
passage of among satellites of Jupiter, 250;
passage of earth and moon through tail of, 257, 346

Comet of 1000 A.D., 262;
1066, 262–264;
1680, 255, 265;
1811, 254–255;
1861, 254, 257, 346;
1881, 257–258;
1882, 251, 258, 291;
1889, 258;
1907, 258

Comets, 27–28, 58, Chaps. XIX. and XX., 345–346;
ancient view of, 259–261;
captured, 251–253;
Chinese records of, 83–84;
composition of, 252;
contrasted with planets, 247;
families of, 251–252, 256;
meteor swarms and, 274;
revealed by solar eclipses, 95–96;
tails of, 141, 182, 248, 252–254

Common, telescopes of Dr. A.A., 118

Conjunction, 209

Constellations, 105, 278–279, 285, 289

Contraction theory of sun's heat, 128–129, 335

Cook, Captain, 154

Cooke, 118

Copernican system, 20, 107, 149, 170–173, 279, 280

Copernicus, 20, 108, 149, 158, 170–172, 236

Copernicus (lunar crater), 200, 204

Copper, 145

Corder, H., 144

Corona, 70–72, 90, 92–97, 132, 140–141, 270;
earliest drawing of, 91;
earliest employment of term, 90;
earliest mention of, 86;
earliest photograph of, 93;
illumination given by, 71;
possible change in shape of during eclipse, 96–98;
structure of, 142–143;
variations in shape of, 141

Corona Borealis (constellation), 295

Coronal matter, 142;
streamers, 95–96, 141–143

Coronium, 133, 142, 317

Cotes, 91

Coudé, equatorial, 119

Cowell, P.H., 255, 264

Crabtree, 152

Crape ring of Saturn, 236–237

Craterlets on Mars, 220

Craters (ring-mountains) on moon, 197–205, 214, 340;
suggested origin of, 203–204, 214

Crawford, Earl of, 94

Crecy, supposed eclipse at battle of, 88–89

Crescent moon, 183, 185

Crommelin, A.C.D., 255, 264

Crossley Reflector, 118, 315–316

Crown glass, 115

Crucifixion, darkness of, 86

Crucis, α (Alpha), 298

Crux, or "Southern Cross" (constellation), 298–299, 323

Cycle, sunspot, 136–137, 141, 143–144

Cygni, 61, 173, 280

Cygnus, or the Swan (constellation), 295, 325


Daniel's Comet of 1897, 258

Danzig, 111

Dark Ages, 102, 107, 260

Dark eclipses of moon, 65, 102–103

Dark matter in space, 323

Dark meteors, 275–276

Dark stars, 309–310, 312, 323, 346–347

"Darkness behind the stars," 325

Darwin, Sir G.H., 339

Davis, 94

Dawes, 236

Dearborn Observatory, 303

Death from fright at eclipse, 73

Debonnaire, Louis le, 88,