436 



General Index 



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



Saros, i. 17 ; n. 43 



Satellites, vi. 121, 127, 129, 133 ; 

 vn. 145, 150; vni. 154, 160, 

 162; ix. 170, 183-185; x. 210, 

 216; xi. 228, 248; xn. 253, 

 255, 267 ; xm. 272, 283, 295, 

 296, 297, 318, 320. See also 

 Jupiter, Saturn, etc., satellites 

 of 



Satellites, direction of revolution 

 of, xi. 250 ; xm. 295, 318 



Satellites, rotation of, xi. 250 ; 

 xn. 267 ; xm. 297 



Saturn, i. 14-16; n. 25, 51; iv. 

 81, 87; v. 99; vi. 123; vn. 

 136 n, 142, 144; vm. 154, 156; 

 ix. 183, 185, 186; x. 204; xi. 

 228, 231, 235, 236, 243-246; 

 xii. 253, 267; xm. 288, 297. 

 See also the following headings 



Saturn, mass of, ix. 185 



Saturn, rings of, vi. 123 ; vni. 

 154, 160 ; xi. 228, 248 ; xn. 267; 

 xm. 295, 297 



Saturn, rotation of, xn. 267 ; xm. 

 297 



Saturn, satellites of, vni. 154, 

 160 ; ix. 184 ; xi. 228 ; xn. 253, 

 255, 267 ; xm. 295, 297, 307 



Scientific method, n. 54 ; vi. 134 ; 

 ix. 195 



Seas (on the moon), vi. 1 19 ; vm. 

 153; xm. 296 



Seasons, i. 3 ; n. 35, 39 ; iv. 82 ; 

 xi. 245 



Second (angle), i. 7 



Secular acceleration of the moon's 

 mean motion, x. 201 ; xi. 233, 

 234, 240, 242 ; xm. 287 



Secular inequalities. See In- 

 equalities, secular 



Selenographia (of Hevel), vm. 



153 

 Sele notopograph ische Fragtn ente 



(of Schroeter), xn. 271 

 Sequences, method of, xn. 266 

 Shadow of earth, moon. See 



Eclipses 



" Shining-fluid " theory, xn. 260; 



xm. 310, 311 



Shooting stars. See Meteors 

 Short-period comets, xm. 291 

 Sidereal month, 11. 40 

 Sidereal period, iv. 86, 87 

 Sidereal system, structure of, xii. 



257, 258, 259-262; xm. 317 

 Sidereal year, 11. 42 

 Sidereus Nuncius (of Galilei), vi. 



119-122 

 "Sights," v. no; vm. 155 x. 



198 



Signs of the zodiac, i. 13 

 Sine, ii. 47 n ; m. 59 n, 68 n 

 Sirius, xm. 316 n 

 Solar eclipse. See Eclipse 

 Solar system, stability of, xi. 245 ; 



xm. 288, 293 



Solstices, i. 11 ; 11. 36, 39, 42 

 Solstitial points, i. 1 1 

 Space-penetrating power, xn. 



258 



Spanish astronomy, in. 61, 66 

 Spectroscope, xm. 299. See also 



Spectrum analysis 

 Spectrum, spectrum analysis, ix. 



168; xm. 273, 299-302, 303, 



304,306,309,311-314,317,318 

 Sphaera Mundi (of Sacrobosco), 



m. 67 

 Sphere, attraction of, ix. 173, 



182 ; xi. 228 

 Sphere, celestial. See Celestial 



sphere 

 Sphere, doctrine of the. See 



Spherics 

 Spheres, celestial, crystal. See 



Celestial spheres 

 Spheres, music of the, n. 23; vn. 



144 

 Spherical form of the earth, moon. 



See Earth, Moon, shape of 

 Spherics, 11. 33, 34 

 Spica, ii. 42 



Spiral nebulae, xm. 310 

 Stability of the solar system, xi. 



245 ; xm. 288, 293 



