arwin, 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

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;