A.

Aberration of Light, def. 103;
also p. 265
Absorption of Light, M 182-183
Acceleration of Moon's mean
motion, D 307

Achromatic Telescope, &c., foot-
note, 261
Acronychal, 358

Action and Reaction H, 208
Aeriform, G 168
Aerolites, Y 287

Air (of the Atmosphere), what
it consists of, 177

-, Providential deviations with
respect to, 178

Airy, Professor (extracts from),
219-220

Algol, variation of its magnitude,
M 280

Albategni," the Ptolemy of the
Arabs," 398

Alexandrian Library, 397
Alhazen, Moorish Astronomer,
398

Amplitude, def. 46; also p. 413
Analemma, def. 66

Ancient Observation and Disco-

very, Chronology of, 393-400
Anaxagoras, 394
Anaximander, 394
Anaximanes, 394

Andes, Influence of, K 295 note
Andromeda, note, 408
Angle, L 2, and 3 on p. 3
Angle of Position, def. 47
Angular Motion, (Velocity,) 100
Animals, inferior, susceptibility
of, 197

Annual Distribution of Light and
Heat, 113-117

Antarctic Pole, Circle, &c., def.
10

Antarctic Expedition, foot-note,
205

Antecanis, note, 409

Antipodes, def. 79, also remarks
on 149-150

Antœci, def. 78, also remarks on
149-150

Aphelion, def. 97

Apogee, def. 94

Appendix, 401-421
Apparent Bearing, 419
Apparent Noon, def. 85
Apses, or Apsides, def. 98
Aquila, note, 411
Arabian Astronomy, 398
Arago, M., V 285

153

Latitude and Longitude,

Centre, imaginary, of the Uni-
verse, 420

Centre of Gravity, 221-223
Centrifugal Force, 223-226
Centripetal Force, B 221
Cepheus, 407

Cerberus, note, 409
Ceres, 270

Chaldæans, Astronomy of the,
V 393

Charles's Wain, 416 and note
Chemical Rays of the Spectrum,
188-190

Chinese, Astronomy of the, W
393

Chord of an Arc, F 17
Chronology, application of As-
tronomical Observation to, 365

Chronology of Ancient Observa-
tion, &c., 393-400

Circle, F 1

Circles, Comparison of, G 15

Great and Small, D 8

Polar, def. 68

Hour, def. 26
Vertical, def. 42

Circumference of a Circle, P 2
Civil Day, def. 104
Climate, B and C 113
Climates, def. 80

Clock, Sidereal, def. 53

Clouds, 2 of D 177; also 178-
181

197

Electrified, 1 and 2 of K

Cohesion, Attraction of, D, and
note, 167

Cold, remarkable
against, 2, p. 173

Columbus, note, 414

provision

Colours of the Spectrum, 1 of V

187

V 187

of the Fixed Stars, 4 of

Colures, def. 67

Comets, 271-274

Comet of Halley, M and N 271

-272

Compass, def. 36

Densities, mean, of the planets,
3, p. 260

Depth, mean, of the ocean, foot
note, 171

Deserts, influence of, M 296
Descension, oblique, def. 55
Descensional difference, note, def.
56

Deviations, Remarkable Provi-
dential ones, 177–178
Dew, 3 of R, 173

Dew-point, foot-note, 180
Dialling, 379-386
Diameter, K 2

Diameter of the Earth, a method
of finding, Q 20-21
Diameter of the Sun, Q 238
of the Moon, P 299
Diana, a name of the Moon, 299
Dichotomize, 396

T