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, [a] (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, 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