434 



General Index 



\Romanfigures refer to the chapters, Arabic to the articles .] 



Parallax of the moon. See Moon, 



parallax of 

 Parallax of the sun. See Sun, 



parallax of 

 Parallax, stellar, iv. 92; v. 100 ; 



vi. 129 ; vni. 161 ; x. 207, 212 ; 



xii. 257, 258, 263, 264; xni. 



272, 278, 279 



Parallelogram offerees, ix. i8o;z 

 Parameters, variation of,xi.233 n. 



See also Variation of elements 

 TlapaTrrfY/uLara, n. 2O 

 Partial eclipses, n. 43 

 Pendulum, pendulum clock, v. 



98; vi. 114; vin. 157, 158, 



161; ix. 180, 187; x. 199, 217, 



221, 223; xi. 231. See also 



Gravity, variation of 

 Pendulum Clock (of Huygens), 



vm. 158; ix. 171 

 Penumbra (of a sun-spot), vi. 



124 ; xn. 268 

 Perigee, n. 39, 40, 48; iv. 85. 



See also Apse, apse-line 

 Perihelion, iv. 85 ; xi. 231. See 



also Apse, apse-line 

 Periodic inequalities. See In- 

 equalities, periodic 

 Perturbations, vm. 156; ix. 183, 



184 ; x. 200, 204, 224, 227 ; XI. 



passim ; xm. 282, 293, 294, 297 

 Phases of the moon. See Moon, 



phases of 



Phenomena (of Euclid), n. 33 

 Pbobos, xm. 295 

 Photography, xm. 274, 279-281, 



294, 298, 299, 301, 306 

 Photometry, xm. 316. See also 



Stars, brightness of 

 Photosphere, xii. 268 ; xm. 303 

 Physical double stars, xn. 264. 



See also Stars, double and mul- 

 tiple 

 Planetary tables. See Tables, 



planetary 

 Planetary theory, n. 51, 52, 54; 



in. 68 ; iv. 86-90 ; xi. 228, 230, 



231, 233, 235, 236, 242-247, 



248; xm. 286, 288-290, 293. 

 See also Planets, motion of 

 Planets, i. 13, 14, 15, 16; n. 23- 

 27. 3, 3 2 > 5i J i- 68; iv. 81 ; 

 v. 104, 105, no, 112; vi. 119, 

 121 ; vn. 136, 144; vm. 154, 

 155; x. 200; xi. 228, 250; xn 



253, 255, 257, 267, 271; xm. 

 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, xn. 253, 



254, 255, 267; xm. 289, 294, 

 295, 3i8 



Planets, distances of, i. 15 ; n. 30, 

 51 ; iv. 81, 86, 87 ; vi. 117; 

 vn. 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; xm. 294. See also 

 under the several planets 



Planets, minor. See Minor planets 



Planets, motion of, i. 13, 14, 15; 

 n. 23-25, 26, 27, 30, 41, 45, 47, 

 51, 52 ; m. 62, 68 ; iv. 81, 86- 

 90, 92; v. 100, 104, 105, 112; 

 vi. 119, 121, 129; vn. 139-142, 

 144, 145, 150, 151 ; vm. 152, 

 156; ix. 169,170,172-177, 181, 

 183, 194; x. 199, 204; xi. 228, 

 229, 245, 250; xm. 275, 276, 

 282, 294. See also Planetary 

 theory 



Planets, rotation of, vm. 160 ; ix. 

 187; xi. 228, 250; xn. 267; 

 xm. 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. 



Pleiades, vi. 120; xn. 260 



Poles (of a great circle), n. 

 33 



