[Roman figures refer to the chapters, Arabic to the articles.]
Parallax of the sun. See Sun, parallax of
Parallax, stellar, iv. 92; v. 100; vi. 129; viii. 161; x. 207, 212; xii. 257, 258, 263, 264; xiii. 272, 278, 279
Parallelogram of forces, ix. 180 n
Parameters, variation of, xi. 233 n. See also Variation of elements
Παραπήγματα, ii. 20
Partial eclipses, ii. 43
Pendulum, pendulum clock, v. 98; vi. 114; viii. 157, 158, 161; ix. 180, 187; x. 199, 217, 221, 223; xi. 231. See also Gravity, variation of
Pendulum Clock (of Huygens), viii. 158; ix. 171
Penumbra (of a sun-spot), vi. 124; xii. 268
Perigee, ii. 39, 40, 48; iv. 85. See also Apse, apse-line
Perihelion, iv. 85; xi. 231. See also Apse, apse-line
Periodic inequalities. See Inequalities, periodic
Perturbations, viii. 156; ix. 183, 184; x. 200, 204, 224, 227; XI. passim; xiii. 282, 293, 294, 297
Phases of the moon. See Moon, phases of
Phenomena (of Euclid), ii. 33
Phobos, xiii. 295
Photography, xiii. 274, 279–281, 294, 298, 299, 301, 306
Photometry, xiii. 316. See also Stars, brightness of
Photosphere, xii. 268; xiii. 303
Physical double stars, xii. 264. See also Stars, double and multiple
Planetary tables. See Tables, planetary
Planetary theory, ii. 51, 52, 54; iii. 68; iv. 86–90; xi. 228, 230, 231, 233, 235, 236, 242–247, 248; xiii. 286, 288–290, 293. See also Planets, motion of
Planets, i. 13, 14, 15, 16; ii. 23–27, 30, 32, 51; iii. 68; iv. 81; v. 104, 105, 110, 112; vi. 119, 121; vii. 136, 144; viii. 154, 155; x. 200; xi. 228, 250; xii. 253, 255, 257, 267, 271; xiii. 272, 275, 276, 281, 282, 294–296, 297, 318, 320. See also the following headings, and the several planets Mercury, Venus, etc.
Planets, discoveries of, xii. 253, 254, 255, 267; xiii. 289, 294, 295, 318
Planets, distances of, i. 15; ii. 30, 51; iv. 81, 86, 87; vi. 117; vii. 136, 144; ix. 169, 172, 173
Planets, inferior, i. 15; iv. 87, 88. See also Mercury, Venus
Planets, masses of, ix. 185; xi. 245, 248; xiii. 294. See also under the several planets
Planets, minor. See Minor planets
Planets, motion of, i. 13, 14, 15; ii. 23–25, 26, 27, 30, 41, 45, 47, 51, 52; iii. 62, 68; iv. 81, 86–90, 92; v. 100, 104, 105, 112; vi. 119, 121, 129; vii. 139–142, 144, 145, 150, 151; viii. 152, 156; ix. 169, 170, 172–177, 181, 183, 194; x. 199, 204; xi. 228, 229, 245, 250; xiii. 275, 276, 282, 294. See also Planetary theory
Planets, rotation of, viii. 160; ix. 187; xi. 228, 250; xii. 267; xiii. 297
Planets, satellites of. See Satellites
Planets, stationary points of, i. 14; ii. 51; iv. 88
Planets, superior, i. 15; iv. 87, 88. See also Mars, Jupiter, etc.
Poles (of a great circle), ii. 33 n