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Obey Kepler's laws, 533. Eclipses / distribution of stars, 793. Discovery
of Jupiter's, 535... Other phænomena of parallax of a Lyrå, 813. Ca.
of, 540. Their dimensions and talogue and observation of double
masses, 540. Discovery, 544. Ve-l stars, 835.

locity of light ascertained from, 545. Struve, Otto, his researches on proper
Saturn, remarkable deficiency of density, motions, 854.

508. Rings of, 514. Physical de- Style, old and new, 932.
scription of, 514. Satellites of, 547. Sun, oval shape and great size on
and Appendix. (See also elements horizon explained, 47. Apparent mo-
in Appendix.)

tion not uniform, 34. Orbit elliptic,
Sea, proportion of its depth to radius 349. Greatest and least distances,

of the globe, 31. Its action in mo- | 350. Actual distance, 357. Mag-
delling the external form of the nitude, 358. Rotation on axis, 359.
earth, 227.

390. Mass, 360. Physical consti-
Seasons explained, 362... Temperature tution, 386. Spots, ib.... Situation of
of, 366.

its equator, 390... Maculiferous zones
Sector, zenith, 192.

of, 393. Atmosphere, 395. Tempe-
Secular variations, 655.

rature, 396. Expenditure of heat,
Selenography, 437.

397. Eclipses, 420. Density of, 447.
Sextant, 193...

Natural center of planetary system,
Shadow, dimensions of the earth's, 422. 462. Distance, how determined, 479.

428. Cast by Venus, 467. Of Ju Its size illustrated, 526. Action in

piter's satellites seen on disc, 540. producing tides, 751. Proper motion
Shooting stars used for finding longi of, 854... Absolute velocity of in space,

tudes, 265. Periodical, 900. (See 858. Central, speculations on, 861.
Meteors.

Sunsets, two, witnessed in one day, 26.
Sidereal time, 110. 910. Year. (See Survey, trigonometrical nature of, 274.

Year.) Day. (See Day.). Synodic revolution, 418. Of sun and
Signs of zodiac, 380.

moon, ib.
Sirius, its parallax and absolute light,

818.
Solar cycle, 921.
Sphere,' 95. Projections of, 280. At- Tangential force and its effects, 618.
traction of, 735., note.

Momentary action on perihelia, 673.
Spheroidal form of Earth (see Earth) Wholly influential on velocity, 660.

produces inequalities in the moon's Produces variations of axis, ib. ...
motion, 749.

Doubles the rate of advance of lunar
Spots on Sun, 389...

apsides, 686. Of Neptune on
Stars, visible by day, 61. Fixed, 777... Uranus, and its effects, 774.

Their apparent magnitudes, 778... | Telescope, 154. Its application to as-
Comparison by an astrometer, 783. tronomical instruments, 117.
Law of distribution over heavens, Telescopic sights, invention of, 158., note.
785... alike in either hemisphere, 794. Temperature of earth's surface at diffe-
Parallax of certain, 815. Discs of, rent seasons, 366. In South Africa
816. Real size and absolute light. L and Australia, 369. Of the sun, 396.
817. Periodical, 820... Temporary, Tethys, 548., note.
827. Irregular, 830. Missing, 832. | Theodolite, 192. Its use in surveying,
Double, 833... Coloured, 851., and! 276.
note. Proper motions of, 852. Ir Theory of instrumental errors, 141. Of
regularities in motions not verified, gravitation 490... Of nebulous subsi-
859. Clusters of, 864... Nebulous, dence and sidereal aggregation, 878.

879... Nebulous-double, 880. Tides, a system of forced oscillations,
Stationary points of planets, 459. How 651. Explained, 750... Priming and

determined, 475. Of Mercury and lagging of, 753. Periodical inequal-
Venus, 476.

ities of, 755. Instances of very high,
Stereographic projection, 281.

756.
Stones, meteoric, 898. Great shower Time, sidereal, 110. 327. 911. Local,
of, ib.

129. 152. Measures angular motion,
Struve, his researches on the law of 149. How itself measured, 150...
Very small intervals of, 150. Equi-1 and secular, 655. Incident on the
noctial, 257. 925... Measures, units,
and reckoning of, 906...

Velocity, angular, of sun not uniform,
Titan, 548., note.

350. Linear, of sun not uniform,
Titius, Prof., his law of planetary disa 351. Of planets, Mercury, Venus,
_tances, 505., note.

and Earth, 474. 'Of light, 545. of
Trade winds, 239...

shooting stars, 899. 904.
Transit instrument, 159...

Venus, synodic revolution of, 472. Sta-
Transits of stars, 152. Of planets tionary points, 476. Velocity of, 474.

across the sun, 467. Of Venus, 479 Phases, 477. Point of greatest bright-
... Mercury, 483. Of Jupiter's satel ness, 478. Transits of, 479. Phy-
lites across disc, 540. Of their sha sical description and appearance, 509.
dows, 549.

Inequality in earth's motion pro-
Transparency of space, supposed by duced by, 726. In that of the moon,
Olbers imperfect, 798.

743...
Transversal disturbing force, and its Vernier, 97.
effects, 615...

Vertical, prime, 102. Circles, 100.
Trigonometrical survey, 274.

Vesta, discovery of, 505.
Tropics, 93. 380.
Twilight, 44.

W.
U.

Weight of bodies in different latitudes,

322. Of a body on the moon, 508.
Umbra in eclipses, 420. Of Jupiter, On the sun, 450.
538.

Winds, trade, 240...
Uranography, 111. 300.
Uranographical corrections, 342... Pro-
blems, 127... 309...

Y.
Uranus, discovery of, 505. Heat re- Year, sidereal, 305. Tropical, 383.

ceived from sun by, 508. Physical Anomalistic, 384., and day incom-
description of, 523. Satellites of, mensurable, 913. Leap, 914. Of
551. Perturbations of by Neptune, confusion, 917. Beginning of, in
760... Old observations of, 760. England changed, 932.

V.

Z.
Vanishing point of parallel lines, 116. Zenith, 99. Sector, 192.
Line of parallel planes, 117.

Zodiac, 305.
Variation of the moon explained, 705... Zodiacal light, 899.
Variations of elements, 653. Periodical | Zones of climate and latitude, 382.

THE END.

LONDON:

A, and G. A. SPOTTISWOODE,

New-street-Square.

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London: Longman Brown Creen & Lan grans.

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