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Obey Kepler's laws, 533. Eclipses
of Jupiter's, 535... Other phenomena
of, 540. Their dimensions and
masses, 540. Discovery, 544. Ve-
locity of light ascertained from, 545.

Saturn, remarkable deficiency of density,
508. Bines of, 514. Physical de-
scription of, 514. Satellites of, 547.
and Appendix. {See also elements
in Appendix.)

Sea, proportion of its depth to radios
of the globe, 31. Its action in mo-
delling tho external form of tho
earth, 227.

Seasons explained, 362... Temperature
of, 366.

Sector, zenith, 192.

Secular variations, 655.

Selenography, 437.

Sextant, 193...

Shadow, dimensions of the earth's, 422.
428. Cast by Venus, 467. Of Ju-
piter's satellites seen on disc, 540.

Shooting stars used for finding longi-
tudes, 265. Periodical, 900. (See
Meteors.

Sidereal time, 110. 910. Year. (See
Year.) Day. (See Day.)

Signs of zodiac, 380.

Sirius, its parallax and absoluto light,
818.

Solar cycle, 921.

Sphere, 95. Projections of, 280. At-
traction of, 735., note.

Spheroidal form of Earth (see Earth)
produces inequalities in the moon's
motion, 749.

Spots on Sun, 389...

Stars, visible by day, 61. Fixed, 777...
Their apparent magnitudes, 778...
Comparison by an astrometer, 783.
Law of distribution over heavens,
765... alike in either hemisphere, 794.
Parallax of certain, 815. Discs of,

816. Beal size and absolute light.

817. Periodical, 820... Temporary,
827. Irregular, 830. Missing, 832.
Double, 833... Coloured, 851., and
note. Proper motions of, 852. Ir-
regularities in motions not verified,
859. Clusters of, 864... Nebulous,
879... Nebulous-double, 880.

Stationary points of planets, 459. How
determined, 475. Of Mercury and
Venus, 476.

Slercographic projection, 281.

Stones, meteoric, 898. Great shower
of, ib.

Struve, his researches on the law of

distribution of stars, 793. Discovery
of parallax of a Lyras, 813. Ca-
talogue and observation of double
stars, 835.

Struve, Otto, his researches on proper
motions, 854.

Style, old and new, 932.

Sun, oval shape and great size on
horizon explained, 47. Apparent mo-
tion not uniform, 34. Orbit elliptic,

349. Greatest and least distances,

350. Actual distance, 357. Mag-
nitude, 358. Rotation on axis, 359.
390. Mass, 360. Physical consti-
tution, 386. Spots, to.... Situation of
its equator, 390... Maculiferous zones
of, 393. Atmosphere, 395. Tempe-
rature, 396. Expenditure of heat,
397. Eclipses, 420. Density of, 447.
Natural center of planetary system,
462. Distance, how determined, 479.
Its size illustrated, 526. Action in
producing tides, 751. ftoper motion
of, 654... Absolute velocity of in space,
858. Central, speculations on, 861.

Sunsets, two, witnessed in one day, 26.
Survey, trigonometrical nature of, 274.
Synodic revolution, 418. Of sun and
moon, ib.

Tangential force and its effects, 618.
Momentary action on perihelia, 673.
Wholly influential on velocity, 66a
Produces variations of axis, ib. ...
Doubles the rate of advance of lunar
apsides, 686. Of Neptune on
Uranus, and its effects, 774.

Telescope, 154. Its application to as-
tronomical instruments, 117.

Telescopic sights, invention of, 158, note.

Temperature of earth's surface at diffe-
rent seasons, 366. In South Africa
and Australia, 369. Of the son, 396.

Tethys, 548,, note.

Theodolite, 192. Its use in surveying,
276.

Theory of instrumental errors, 141. Of
gravitation 490... Of nebulous subsi-
dence and sidereal aggregation, 672.

Tides, a system of forced oscillations,
651. Explained, 750... Priming and
lagging of, 759. Periodical inequal-
ities of, 755. Instances of very high,
756.

Time, sidereal, 110. 327.911. Local,
129.152. Measures angular motion,
149. How itself measured, 150...
Very small intervals of, 150. Equi-
noctial, 257. 925... Measures, units,
and reckoning of, 906...

Titan, 548., note

Titius, Prof., his law of planetary dis-
tances, 505., note.

Trade winds, 239...

Transit instrument, 159...

Transits of stars, 152. Of planets
across the sun, 467. Of Venus, 479
... Mercury, 483. Of Jupiter's satel-
lites across disc, 540. Of their sha-
dows, 549.

Transparency of space, supposed by
Olbers imperfect, 798.

Transversal disturbing force, and its
effects, 615...

Trigonometrical survey, 274.

Tropics, 93. 380.

Twilight, 44.

U.

Umbra In eclipses, 420. Of Jupiter,
538.

L'ranography, 111. 300.

Uranographical corrections, 342... Pro*
blcms, 127... 309...

Uranus, discovery of, 505. Heat re-
ceived from sun by, 508. Physical
description of, 523. Satellites of,
551. Perturbations of by Neptune,
760... Old observations of, 760.

and secular, 655. Incident on the
epoch, 731.
Velocity, angular, of sun not uniform,

350. Linear, of sun not uniform,

351. Of planets, Mercury, Venus,
and Earth, 474. Of light, 545. Of
shooting stars, 899. 904.

Venus, synodic revolution of, 472. Sta-
tionary points, 476. Velocity of, 474.
Phases, 477. Point of greatest bright-
ness, 478. Transits of, 479. Phy-
sical description and appearance, 509.
Inequality in earth's motion pro-
duced by, 726. In that of the moon,
743...

Vernier, 97.

Vertical, prime, 102. Circles, 100.

Vesta, discovery of, 505.

W.

Weight of bodies in different latitudes,
322. Of a body on the moon, 508.
On the sun, 450.

Winds, trade, 240...

Year, sidereal, 305. Tropical, 383.
Anomalistic, 384., and day incom-
mensurable, 913. Leap, 914. Of
confusion, 917. Beginning of, in
England changed, 932.

Vanishing point of parallel lines, 116.

Line of parallel planes, 117.
Variation of the moon explained, 705...
Variations of dements, 653. Periodical

Zenith, 99. Sector, 192.

Zodiac, 305.

Zodiacal light, 899.

Zones of climate and latitude, 382.

THE END.

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INDEX.

N. B. The references are to the articles, not to the pages.

... attached to a reference number indicates that the reference extends to the article cited, and
several subsequent In succession.

Assxmjtioh of light explained, 329.
Ji.s uranographical effects, 333. Of
an object in motion, 33S. How dis-
tinguished from parallax, BOj. Sys-
tematic, 6C2.

About Wrfa, 705.

Acceleration, secular, of moon's mean
motion, 740.

Adams, 506. 767.

Adjustment, errors of, in instrument*,
136. Of particular instruments. (See
those instruments.)

JEtna, portion of earth visiblo from, 32.
Height of, 32. note.

Air, rarefaction of, 33. Law of den-
sity, 37. Refractive power affected
by moisture, 41.

Airy, G. B. Esq., hi* results respecting
figure of the earth, 220. Researches
on perturbations of the earth by
Venus, 726. Rectification of the mass
of Jupiter, 757.

Aiool, 821.

Altitude and azimuth instrument, 187.
—a. Kauai, method of, 188.

Andromeda, nebula in, 874.

Amjlt of position, 204. Of situation, 311.

Am/lrn, measurement of, 163. 167.
Hoar, 107.

Angular velocity, Uw of, variation of,
350.

Anomalistic year, 384.

Anomaly of a planet, 499.

Annular nebulae, 875.

Apex of aberration, 343. Of parallax,
343. Of refraction, 343. Solar, 854.
Of shooting Han, 902. 904.
Aphelion, 368.

Apogee of moon, 406. Fcriod of it*
revolution, 687.

Apsides, 406. Motion of investigated,
675. Application to lunar, 676...
Motion of, illustrated by experiment,

692. Of planetary orbits, 694. Li-
brution of, 694. Motion in orbits
very near to circles, 696. In excen-
tric orbits, 697...

Areas, Kepler's law of, 490.

Argelamlir, liis researches on variablo
stars, 820..., on sun's proper mo-
tion, 654.

Argo, nebulas in, 887. Irregular star n
in constellation, 830.

Ascension, right, 108. (Sec Right ascen-
sion.)

Asteroid*, their existence suspected pre-
vious to their discovery, 505. Ap-
pearance in telescopes, 525. Gravity
on surface of, 525. Elements, Appen-
dix, Synoptic Table.

Astraa, discovery of, 505.

Astrometer, 783, 784.

Astronomy. Etymology, 11. General
notions, 11.

Atmosphere, constitution of, 33... Pos-
sible limit of, 36. Rs wares, 37.
Strata, 37. Causes refraction, 38.
Twilight, 44. Total muss of, 148.
Of Jupiter, 513.

Attraction of a sphere, 445—450. {See
Gravitation.)

Augmentation of moon's apparent dia-
meter, 404.

Augustus, his reformation of mistakes
in the Julian calendar, (919.) Kra
of, 926.

Australia, excessive summer tempera-
ture of, 369.

Axis of the earth, 82. Rotation per-
manent , 56. Major of the earth's
orbit, 373. Of sun's rotation, 392.

Axis of a planetary orbit. Momentary
variation of, caused by the tangential
force only, 658. 660. Its variations
periodical, 661... Invariability of,
and bow understood, 668.

Azimuth, 103.—and altitude instru-
ment, 187.

LONDON:

A, and G. A. SPOTTISWOODE,

New-street-Square.

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