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[Roman figures refer to the chapters, Arabic to the articles.]

Arabs, Arab astronomy, ii. 46, 53; iii. 56–61, 64, 66, 68; v. 110; viii. 159; xii. 266

Arctic regions, ii. 35

Arcturus, xii. 258

Aries, first point of (♈), i. 13; ii. 33, 42; iv. 83 n; v. 98, 111; x. 198

Asteroids. See Minor planets

Astrolabe, ii. 49; iii. 66

Astrology, i. 16, 18; iii. 56; v. 99, 100; vii. 136, 149, 151

Astronomiae Fundamenta (of Lacaille), x. 224

Astronomiae Instauratae Mechanica (of Tycho), v. 107

Astronomiae Instauratae Progvmnasmata (of Tycho), v. 104

Astronomical Society, German, xiii. 280

Astronomical Society, Royal, xii. 256, 263

Astronomicum Caesareum (of Apian), v. 97

Astronomisches Jahrbuch, xii. 253

Astronomy, divisions of, xiii. 272

Astronomy, descriptive, xiii. 272, 273, 294

Astronomy, gravitational, x. 196; xiii. 272, 273, 286

Astronomy, observational, xiii. 272, 273

Astronomy, origin of, i. 2

Astronomy, scope of, i. 1

Attraction. See Gravitation

Autumnal equinox, i. 11. See also Equinox

Axioms. See Laws of Motion

Axis (of an ellipse), xi. 236, 244, 245

 

Babylonians. See Chaldaeans

Bagdad, iii. 56, 57, 60, 68

Belts of Jupiter, xii. 267

Betelgeux, iii. 64

Biela's comet, xiii. 305

Binary stars. See Stars, double and multiple

Bode's Astronomisches Jahrbuch, xii. 253

Bodily tides, xiii. 292, 293

Brightness of stars. See Stars, brightness of

Brooks's comet, xiii. 305

Brucia, xiii. 294

Bureau des Longitudes, xi. 238.

 

Cairo, iii. 60

Calculus of Variations, xi. 237 n

Calendar, Greek, ii. 19, 20, 21

Calendar, Gregorian, ii. 22; ix. 165; x. 217

Calendar, Julian, ii. 21, 22; iii. 68; iv. 73; ix. 165 n; x. 197 n, 217

Calendar, Mahometan, iii. 56

Calendar, Roman, ii. 21

Caliphs, iii. 56, 57, 69

Canals of Mars, xiii. 297

Cartesianism, viii. 163; ix. 191, 195; xi. 229

Castor, xii. 263, 264, 266

Catalogues of stars. See Star-catalogues

Cavendish experiment, x. 219

Celestial latitude. See Latitude, celestial

Celestial longitude. See Longitude, celestial

Celestial sphere, i. 7, 8, 9–11, 13, 14; ii. 24, 26, 33, 38–40, 45, 47, 51; iii. 64, 67; iv. 78, 80, 83, 88; v. 98, 105; vi. 129; viii. 157; x. 198, 207, 208, 214; xii. 257; xiii. 272

Celestial sphere, daily motion of. See Daily motion

Celestial spheres, ii. 23, 26, 27, 38, 51, 54; iii. 62, 68; v. 100, 103

Centre of gravity, ix. 186

Centrifugal force, viii. 158 n

Ceres, xiii. 276, 294

Chaldaeans (Babylonians), Chaldaean astronomy, i. 6, 11, 12, 16–18; ii. 30, 34, 40, 51, 54; iii. 56