INDEX.
431
vourable in 1885,369 ; Proctor. Mr., hiswork upon, 366 ; satellites of (seeSatellites ) ; seen from its rings, 371>;from its satellites, 390 ; from Uranus ,398 ; its shado v on the rings, 370, 370,377; size of, 357>; compared with Jupiter ,357); spots upon, 37)7); synodic periodof. 129.
Rings, the, of Saturn —possibly ap*proaching Saturn , 375 : brightestpart of, 369 ; bright side of, whenvisible, 302 ; constitution of, 373,374 ; description of, 357, 307, etc.;dimensions of, 375; disappearancesof, 303, 304; when next to occur,3<>5 ; discovery of, history of suc-cessive, 300, 309, etc.; divisionsin, 291, 307, 374 ; eclipses of Sun by, 380, 384 ; eclipses of Sun on,370; eccentrical, 372; gaps in,291, 374; latitudes, whence in-visible, 383 ; named A, B, o, 357 ;passage of their plane through theEarth , 300 ; their phases, 357, 359,300, etc.; rotation of, 372, 373;satellites, composed of, 374; satel-lites threaded on, 371 ; Saturn seenfrom, 370 ; Saturn , shadow of on,370, 376, 377 ; seen from Saturn ,37 8; seen from satellites, 390 ;thickness of, 371; when next mostwidely opened out, 357 ; ratio oftheir axes at such times, 300.
Satellites of Jupiter , atmospheres of,340; Bode’s law, and, 329-; Copernicantheory, and, 324 ; densities of, 330;discovery of, 321 ; distances of, 327,329; eclipses of, 14, 332, 333, 348;longitude found by, 348 ; eclipses andoccultations of, order of, 337 ; Jupiter seen without satellites, 347; Jupiter as a sun to, 353 ; light of, variations in,345, 340 ; longitude found by, 348 ;movements of, Laplace’s relationbetween, 333; observations of, byEnglemann, 326, 340; Elammarion,346; Galileo, 321, 345; Herschel,345; Laplace, 333; occultations of,335, 337 ; orbits of, when convex tothe Sun , 349; the diameters of, 327 ;planes of, 331 ; paths in space of, 349,351, 352; periods of, sidereal, 329 ;synodic, 323 ; phases of, 331; rotationof, 340 ; seen by the naked $ye, 325;seen in horizon and in zenith, 331; seenthrough the edge of Jupiter , 347;shadows of, size of upon Jupiter , &41;transits of, 339; shadow preceding orfollowing satellite, 340; occulted bysatellite, 352 ; sizes of, 320, 327 ; solareclipses caused by, their duration, 341 ;their frequency, 343; solar system, aminiature. 352 ; transits of, and of theirshadows, 339, 345 ; variations in lightof, 345, 340 ; velocity of light deter-mined by, 14, 348 ; weights of, 330.
of, 249 ; inhabitants of. 201; light of,257; Mars seen from, 201 ; Mars weighed by, .202; may be minorplanets, 252, 293 ; movements, appa-rent, of, 253; seen in horizon andzenith, 250; seen from Mars , 201 ;sizes of, 251; tides caused by, 258 ;transits of across Sun, 202.
Satellite of Neptune , discovery of, 415;distance, size, and orbit of, 415; in-clination of its orbit, 407; retrogrademotion of, 407.
Satellites of Saturn , Bode's law and,386; compared with the solar system,387 ; discovery of, 385 ; distances of,385, 389; eclipses of, 388; Iapetus,variability in light of, 392 ; latitudesin which visible, 388 ; light of, 389 ;periods of, 385, 380 ; rings composedof, 374 ; rings, where hidden by, 387 ;rings seen from, 390 ; seen in horizonand zenith, 388; Saturn seen from,390; sizes of, 385; threaded on thering-line, 371; Titan, shadow of, 391.
Satellites of Uranus , discovery of, 399 ;distances of, 399 ; orbits, inclinationof, 401 ; retrograde motion of, ap-; parent, 404, 406 ; its relation to the| nebular hypothesis.408; periodsof,399.
I Satellite of Venus, 100.
I Schehallien experiment, the, 208.i Schiaparelli, Prof., the axis of Mars , 243 ;canals on Mars , 240.
Schroter, observations of Mercury, 145;
' Scott, Mr. Benjamin, supposed intra-| Mercurial planet, 141.
1 Seasons of the Earth , 173; of the Tropics ,
! 185.
j Secchi, Padre, observations of Sun -spots,
I 33; of prominences, 31.
I Sidereal and solar davs. 222, 228 ; years,
; 927. " ‘
Siemens, Dr.,regeneration of solarenergy.46.
Smyth, Admiral, observation of a satelliteof Jupiter , 347; Saturn 's ring, divisionof, 367.
Solstices, the, 175.
Specular reflection, of Venus , 165.
Spectrum, continuous, 24; diffraction,26 ; lines in, 25; pure, 23 ; solar, 24.
Spectroscope, the, and Mars , 237; andMercury, 153 ; and minor planets, 278;nature of, 23.
Spectroscopic Society, memoirs of Italian,drawings of prominences in, 31 ; ofSun -spots, 35; solar photographs in, 42.
Spheres, crystal, 116.
Spheroids, how generated, 194.
Statious of the planets, 102, 130, 136; ofVenus , 135.
Stone, Mr., diameters of minor planets,277 ; transits of Veuus in 1769 and. 1874, 11, 13.
! Sun , the. in apogee. 228; attraction of,upon the Moon , 57; attraction of,