"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, [ê] (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 Coelostat, 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