432

INDEX.

compared with Jupiter ’s, 422 ; centreof gravity of, and of Jupiter , 310 ;corona of, 43; daylight view of pro-minences of, 29; distance of, 4, 0, 13,14,10,17, 291; most probable value of, 18 ;diurnal path of, 175, 183; eclipses of,87; next, ‘visible in' England, 88;frequency of, 89; duration of, 90;phenomena of, 43; total of, August1808, 92; July, 1878, 28 ; May, 1882,.28; granules, solar, 42; heat of,how maintained, 40 ; light, velocity•of, and the Sun ’s distance, 14 ; mag-netism of the Earth and Sun -spots, 30,39 ; meteors revolving round, 44,424 ;parallax of, 4 ; in perigee, 228; pro-minences of, connected with Sun -spots,34; drawings of, 31 ; eruptive and•quiescent, 34 ; very lofty, 31 ; seen indaylight, 29 ; repulsive force of, 44 ;■spots on (see Sun -spots) ; substances•existing in, 27 ; temperature of, 45 ;•tidal power of, 55; upon Mars , 200;transits of Mercury across, 18, 150;of Venus , 2, 0, 9, 10, 11, 12, 120;Young’s layer upon, 28; zodiacallight of, 44 ; zones of spots and pro-minences, 32.

:Sun -spots, 21; cyclones in, 35; draw-ings of, 35 ; compared with those ofJupiter , 311, 310; large. 39 ; maximaand minima of, 37; origin of, 34 ;affected by the planets, 41, 423 ; showsolar disturbance, 30 ; spectra of, 33 ;their relation to the weather, 40.

Swift, Mr., supposed intra-Mercurialplanet, 142.

•Synodic periods of the planets, 129 ;minor planets, sizes of, 278.

Tacchini, Prof., prominences, drawingsof, 31 (Sun -spots and facuke, drawingsof, 35.

Tebbutt, Mr., transit of Mercury , 152.

Telescope, the, power of the, 328.

Temperature, the, of the Moon ’s surface,80 ; of the Sun , 45.

Teneriffe, the great crater of, 75.

Terby, M., drawings of Jupiter , 310.

Thomson, Sir Wm., solidity of the Earth ,219.

Tides, benefits of, 92 ; prehistoric, 92;on Mars , 258; and the Earth ’s rotation,225 ; and the solidity of the Earth , 219;tidal power of the Sun and Moon, 55.

Tisserand, M., on intra-Mercurial planets,141.

Titan, shadow of, upon Saturn , 391.

Titius,law of the planetary distances, 123.

Todd. Mr., observations of the satellitesof Jupiter , 347.

Transits, ofVenus(seeFertiw); of Mercury (see Mercury ).

Tropics, seasons of the, 185.

Trouvelot , Mr. L., drawing of Jupiter ,307 ; of Saturn , 370.

Ultra-Neptunean planets, 415, 416.

Uranus , axis of, its inclination, 402,408 ;Bode’s law and, 393; discovery of, asa comet, 393; distance of, 390 ; gravityupon, 397; light of, compared withsatellite- of Jupiter , 408 ; past obser-vations of, 395; orbit of, 396; perturba-tions of, by Neptune , 410; proved tobe a planet, 394 ; planets, the, seenfrom, 398; rotation of, supposed,398; satellites of (see Satellites ) ;shape of, 397 ; size of, 397 ; solar heatand light upon, 398 ; velocity of, 397 ;weight of, 397.

Velocity of light, 14, 348.

Velocities of the planets, 117.

Venus , albedo of, 1(13; atmosphere of,165; axis of, 168; brilliancy of, 149; whengreatest, 157; cycle and epicycle of,l0~;daylight observations of, 162; drawingsof transit of, in 1874, 11 ; elongation?greatest, of, 129; habitability of, 169 ;lumi'ere cendrce of, 166 ; mountains on,164; names early, of, 116; orbit of,156;path of,'in 1884, 133; path of, seenfrom the Earth , 104 ; phases of, 159,164,324 ; rotation of, 163,170; satelliteof, 166 ; size of, 155; specular reflectionof, 169 ; when stationary, 135 ; synodic.period of, 129.

Venus , transits of, 2-12. Black Drop,)the10; contact phenomena of, 10; datesof, 2 ; Delisle, method of, 9 ; durationof, 6; Halley, method of, 9; in Juneand December, 126 ; photographs of,12 ; results of, in 1874, 11.

Vesta, minor planet, colour of lightof, 278 ; discovery of, 269 ; distance of,267 ; Olbers ’ hypothesis and, 284 ; sizeof, 278; spectrum of, 278; visible to thenaked ey:, 270.

Vico, De, observations of Venus , 164.

Victoria, minor planet, 292.

Vincent, Mr., supposed intra-Mercurialplanet, 142.

Vogel, Dr., the rotation of Venus , 170;spectroscopic observations of minorplanets, 278.

"Watson, Prof., supposed intra-Mercurialplanet, 142.

Weather, the, and the Moon , 96; andSun -spots, 40.

Winter , moonlight in, 82.

Wolf, Prof., the Sun -spot period, 37.

Wolfius, on inhabitants of Jupiter , 319.

Wray, Mr., drawing of Saturn , 371 ; sup-posed intra-Mercurial planet, 141.

Year, the sidereal, length of, 227.

Young, Dr., reversal of the solar spec-trum, 27 ; on Sun -spots and promi-nences, 33,34.

Zodiac , the, 105.

Zodiacal light, the, 44, 139.

Zbllner, the albedo of the Moon , 163.

Zones of Sun -spots and prominences, 32.