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Degree of meridian, how measured, 210.
... Error admissible in, 215. Length
of in various latitudes, 216. 221.

Diameter* of the earth, 220, 221. Of
planets, synopsis. Appendix. (See
also each planet.)

Dilatation of comets in receding from
the sun, S78.

Diane, 548.

Discs of stars, 816.

Distance of the moon, 403.; the sun,
357.; fixed stars, 807. 812...; polar,
105.

Districts, natural, in heavens, 302.

Disturbing forces, nature of, 609... Ge-
neral estimation of, 611. Numerical
values, 612. Unresolved in direc-
tion, 614. Resolution of, in two
modes, 615. 618. Effects of each
resolved portion, 616... On moon,
expressions of, 676. Geometrical re-
presentations of, 676. 717.

Diurnal motion explained, 58. Paral-
lax, 339. Rotation, 144.

Double refraction, 202. Image micro-
meter, a new, described, 203. Co-
met, 580. Nebuke, 878.

Double Start, 833... Specimens of each
class, 835. Orbitual motion < if, -839.
Subject to Newtonian attraction, 843.
Orbits of particular, 843. Dimen-
sions of these orbits, 844. 848. Co-
loured, 851... Apparent periods af-
fected by motion of light, 863.

Dove, his law of temperature, 370.

E.

Earth. Its motion admissible, 15.
Spherical form of, 18. 22... Optical
effect of its curvature, 25. Diurnal
rotation of, 52. Uniform, 56. Per-
manence of its axis, 57. Figure sphe-
roidal, 219... Dimensions of, 220.
Elliptic figure a result of theory, 229.
Temperature of surface, how main-
tained, 366. Appearance as seen
from moon, 436. Velocity in its
orbit, 474. Disturbance by Venus,
726.

Eclipses, 411... Solar, 420. Lunar, 421
... Annular, 425. Periodic return
of, 426. Number possible in a year,
426. Of Jupiter's satellites, 538. Of
Saturn's, 549.

Ecliptic, 305... Its plane slowly vari-
able, 306. Cause of this variation
explained, 640. Poles oC, 307. Li-
mits, solar, 412. Lunar, 427.

Egyptians, ancient, their chronology,
912.

Elements of a planet's orbit, 493. Va-
riations of, 652... Of double star or-
bits, 843. Synoptic table of planet-
ary, &c, Appendix.

Ellipse, variable, of a planet, 653. Mo-
mentary or osculating, 654.

Elliptic motion a consequence of gravi-
tation, 446. Laws of, 489... Their
theoretical explanation, 491.

Elliplicity of the Earth, 221.

Elongation, 341. Greatest, of Mercury
and Venus, 467.

Enceladus, 548., note.

Encke, comet of, 576. His hypothesis
of the resistance of the ether, 577.

Epoch, one of the elements of a planet's
orbit, 496. Its variation not inde-
pendent, 730. Variations incident
on, 731. 744.

Equation of light, 335. Of the center,
375. Of time, 379. Lunar, 452.
Annnal, of the moon, 738.

Equator, 84.

Equatorial, 185.

Equilibrium, figure of, in a rotating
body, 224.

Equinoctial, 97. Time, 935.

E<piinox, 293. 303.

Equinoxes, precession of, 312. Its ef-
fects, 313. In what consisting, 314...
Its physical cause explained, 642...

Eras, chronological list of, 926.

Errors, classification of, 133. Instru-
mental, 135... Their detection, 140.
Destruction of accidental ones by
taking means, 137. Of clock, how
obtained, 293.

Establishment of a port, 754.

Ether, resistance of, 577.

Eviction of moon, 748.

Excentricities, stability of Lagrange's
theorem respecting, 701.

Excentricitg of earth's orbit, 354. How
ascertained, 377. Of the moon's, 405.
Momentary perturbation of, investi-
gated, 670. Application to lunar
theory, 688. Variations of, in orbits
nearly circular, 696. In excentric
orbits, 697. Permanent inequalities
depending on, 719.

F.

Facula, 338.

Faye, comet of, 584. and Appendix.

Flora, discovery of, 505.

Focus, upper. Its momentary change

of place, 670, 671. Path of, in virtue
of both elements of disturbing force,
704. Traced in the case of the
moon's variation, 706... And paral-
lactic inequality, 712. Circulation of,
about a mean situation in planetary
perturbations, 727.

Force, metaphysical conception of, 439.

Forced vibration, principle of, 650.

Forces, disturbing. Sec Disturbing force.

G.
Galactic circle, 793. Polar distance,

Galaxy composed of stars, 302. Sir
W. Herschel's conception of its form
and structure, 786. Distribution of
stars generally referable to it, 786.
Its course among the constellations,
787... Difficulty of conceiving its
real form, 792. Telescopic analysis
of, 797. In some directions unfathom-
able, in others not, 798.
Galle, Dr., 506. Finds Neptune in

place indicated by theory, 768.
Galloway, his researches on the sun's

proper motion, 855.
Gasparis, Sig. De, discovers a new

planet (Appendix).
Gauging tho heavens, 793.
Gay Lussac, his aeronautic ascent, 32.
Geocentric longitude, 503. Place, 371.

497.
Gcodesical measurements,—their nature,

247...
Geography, 111, 205...
Globular clusters, 865. Their dynami-
cal stability, 866. Specimen list of,
867.
Golden number, 922.
Goodricke, his discovery of variable

stars, 821...
Gravitation, how deduced from pheno-
mena, 444... Elliptic motion a con-
sequence of, 490...
Gravity, center of, tee Center of gravity.
Gravity diminished by centrifugal force,
231. Measures of, statical, 234.
Dynamical, 235. Force of, on the
moon, 433... On bodies at surface
of the sun, 440. Of other planets,
see their names.
Gregorian reform of calendar, 915...

H.

Hattey. IBs comet, 567. First notices
Draper motions of the stars, 85'}.

Hansen. His detection of long ine-
qualities in the moon's motions, 745...

Harding discovers Juno, 505.

Heat, supply of, from sun alike in
summer and winter, 368. How kept
up, 400. Sun's expenditure of esti-
mated, 397. Received from the sun
by different planets, 508. Endured
by comets in perihelio, 592.

Hebe, discovery of, 505.

Heights above the sea, how measured,
286. Mean, of the continents, 289.

Heliocentric place, 500.

Ilelio meter, 201.

Hemispheres, terrestrial and aqueous^*.

Herschd, Sir Wm., discovers Uranus,
505, and two satellites of Saturn, 54$.
His method of gauging the heavens,
793. Views of the structure of the
Milky Way, 786. Of nebular sub-
sidence, and sidereal aggregation. 869.
874. His catalogues of double stars
835. Discovery of their binary con-
nexion, 839. Of the sun's proper
motion, 854. Classifications of ne-
bulas, 868. 879. note.

Horizon, 22. Dip of, 23. 195. Ratioiul
and sensible, 74. Celestial, 98. Ara-
ficial, 163.

Horizontal point of a mural circle, how
determined, 175...

i/our circles, 106.; angle, 107.; gUs*.
150.

Hyperion, Appendix, Saturn's satellites.

lapetus, 548.

Inclination of tho moon's orbit, 406. Of
planet's orbits disturbed by orthogo-
nal force, 619. Physical iniportaneo
of, as an element, 632. Momentary
variation of, estimated, 633. Crite-
rion of momentary increase or dimi-
nution, 635. Its changes periodical
and self-correcting, 636. Application
to case of the moon, 638.

Inclinations, stability of, Lagragc's theo-
rem, 639. Analogous in their per-
turbations to excentricitics, 699.

Inflictions, 923.

Inequality, Parallactic of moon, 712.
Great, of Jupiter and Saturn, 720...

Inequalities, independent of execntri-
city, theory of, 702... Dependent
on, 719.

Intercalation, 916.

Irix, discovery of, 505.

Iron, meteoric, 888.

J.

Juliar. period, 924. Date, 930. Re-
formation, 918.

Juno, discovery of, 505.

Jupiter, physical appearance and de-
scription of, 511. Ellipticity of, 512.
Bella of, 512. Gravity on surface,
508. Satellites of, 510. Seen with-
out satellites, 543. Recommended
as a photometric standard, 783. Ele-
ments of, &c (-See Synoptic Table,
Appendix.)

Jupiter and Saturn, their mutual per-
turbations, 700. 720...

Kater, his mode of measuring small in-
tervals of time, 150. His collimator,
178.

Kepler, his laws, 352. 487. 489. Their
physical interpretation, 490...

Lagging of tides, 753.

Lagrange, his theorems respecting the
stability of the planetary system, C69.
639. 701.

Laplace accounts for the secular accele-
ration of the moon, 740.

Lassell, his discovery of the satellite of
Neptune, 524. Of an eighth satellite
of Saturn, Appendix. He-discovers
two of the satellites of Uranus, 551.

Latitude, terrestrial, 88. Parallels of,
89. How ascertained, 119. 129. Ho-
mer's mode of obtaining, 248. On a
spheroid, 247. Celestial, 308. He-
liocentric, how calculated, 500. Geo-
centric, 503.

Laws of nature how arrived at, 139.
Subordinate, appear first in form of
errors, 139. Kepler's, 352. 487...

Level, spirit, 170. Sea, 285. Strata,287.

Leverrier, 506, 507. 767.

Lexell, comet of, 585.

Libratum of the moon, 435. Of ap-
sides, 694.

Light, aberration of, 331. Velocity of,
331. How ascertained, 545. Equa-
tion of, 335. Extinction of, in tra-
versing space, 798. Distance mea-
sured by its motion, 802... Of certain
stars compared with the sun, 817...
Effect of its mof'on in altering appa-
rent period of a double star, 863.
Zodiacal, 897.

Local time, 252.

London, centra of the terrestrial hemi-
sphere, 284.

Longitude, terrestrial, 90. How deter-
mined, 121. 251... By chronometers,
255. By signals, 264. By electric
telegraph, 262. By shooting stars,
265. By Jupiter's satellites, &c., 266.
By lunar observations, 267... Celes-
tial, 308. Mean and true, 375. He-
liocentric, 600. Geocentric, 603. Of
Jupiter's satellites, curious relations
of, 542.

Lunation (synodic revolution of the
moon), its duration, 418.

M.

Magellanic clouds, 892...

Magnitudes of stars, 780... Common
and photometric scales of, 780... And
Appendix.

Maps, geographical, construction of, 273.
Celestial, 290... Of the moon, 437.

Mars, phases of, 484. Gravity on sur-
face, 508. Continents and seas of,
510. Elements (Appendix).

Masses of planets determined by their
satellites, 532. By their mutual
perturbations, 757. Of Jupiter's
satellites, 758. Of the moon, 759.

Menstrual equation, 528.

Mercator's projections, 283.

Mercury, synodic revolution of, 472.
Velocity in orbits, 474. Stationary
points of, 476. Phases, 477. Greatest
elongations, 482. Transits of, 4S3.
Heat received from sun, 508. Phy-
sical appearance and description, 509
Elements of (Appendix).

Meridian, terrestrial, 85. Celestial, 101.
Line, 87. 190. Circle, 174. Mark.
190. Arc, how measured, 213. Arcs,
lengths of, in various latitudes, 216.

Messier, his catalogue of nebuke, 865.

Meteors,S9S. Periodical,900... Heights
of, 904.

Metis, discovery of, 605.

Micrometers, 199...

Milky way. {See Galaxy, 302.)

Mimas, 550., and note.

Mira Ceti, 820.

Moon, her motion among the stars, 401.
Distance of, 403. Magnitude and
horizontal parallax, 404. Augmen-
tation, 404. Her orbit, 405. Revo-
lution of nodes, 407. Apsides, 409.
Occultation of stars by, 414. Phases
of, 416. Brightness of surface, 417.,
note. Redness in eclipses, 422.
Physical constitution of, 429... Desti-
tute of sensible atmosphere, 431.
Mountains of, 430. Climate, 431...
Inhabitants, 434. Influence on wea-
ther, 432., and note. Rotation on
axis, 435. Appearance from earth,
436. Maps and models of, 437. Real
form of orbit round the sun, 452.
Gravity on surface, 508. Motion of
her nodes and change of inclination
explained, 638... Motion of apsides,
676... Variation of excentricity, 688
... Parallactic inequality, 712. An-
nual equation, 738. Erection, 74S.
Variation, 705... Tides produced by,
751.

Motion, apparent and real, 15. Diurnal,
52. Parallactic, 68. Relative and
absolute, 78... Angular, how mea-
sured, 149. Proper, of stars, 852...
Of sun, 854.

Mountains, their proportion to the globe,
29. Of the moon, 430.

Mowna Roa, 32.

Mural circle, 168.

N.

Nabonassar, era of, 926.

Nadir, 99.

Nebulae, classifications of, 868.879., note.
Law of distribution, 868. Resolvable,
870. Elliptic, 873. Of Andromeda,
874. Annular, 875. Planetary, 876.
Coloured, ib. Double, 878. Of sub-
regular forms, 881, 882. Irregular,
883. Of Orion, 885. OfArgo,887.
Of Sagittarius, 888. Of Cygnus, 891.

Nebular hypothesis, 872.

Nebulous matter, 871. Stars, 880.

Neptune, discovery of, 506. 768. Per-
turbations produced on Uranus by,
analysed, 765... Place indicated by
theory, 767. Elementaof, 771... Per-
turbing forces of, on Uranus, geo-
metrically exhibited, 773. Their
effects, 774...

Newton, his theory of gravitation, 490...
et passim.

Nodes of the sun's equator, 390. Of
the moon's orbit, 407. Passage of
planets through, 460. Of planetary
orbits, 495. Perturbation of, 620...
Criterion of their advance or recess,
622. Recede on the disturbing orbit,
624... Motion of the moon's theory of,
638. Analogy of their variations to
those of perihelia, 699.

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Nomenclature of Saturn's satellites, 5*8,
note.

Nonagesimal point, how found, 310.

Normal disturbing force and its effects,
618. Action on excentricity and
perihelion, 673. Action on lunar
apsides, 676. Of Neptune on Granns,
its effects, 775.

Nubecula, major and minor, 892...

Number, golden, 922.

Nutation, in what consisting, 321. Period,

322. Common to all celestial bodies,

323. Explained on physical prin-
ciples, 648.

O.

Obliquity of ecliptic, 303. ProdocM
the variations of season, 362. Slowly
diminishing, and why, 640.

Observation, astronomical, its peculiari-
ties, 138.

Occultation, perpetual, circle of, 113.
Of a star by the moon, 413... OfJn-
piter's satellites by the body, 511.
Of Saturn's, 549.

Olbcrs discovers Pallas and Vests, 505.
His hypothesis of the partial opacity
of space, 798.

Opacity, partial, of space, 798.

Oscillations, forced, principle of, 650.

Orbits of planets, their elements (Ap-
pendix) of doable stars, 843. Of
comets. (See comets.)

Ortliogonal disturbing force, and ia
effects, 616. 619.

Orthograpluc projection, 280.

P.

Politick discovers the variability of
Algol, 821.

Pallas, discovery of, 505.

Parallactic instrument, 185. Inequality
of the moon, 712. Of planets, 713-
Un it of sidereal distances, 804. Mo-
tion, 68.

Parallax, 70. Geocentric ox diurai,
339. Heliocentric, 341. HorUontt,
355. Of the moon, 404. Of the
sun, 357.479.481. Annual, of SUB.
800. How investigated, 805... Of
particular stars, 812, 813. 815. Sys-
tematic, 862.

Peak of Teneriffe, 32.

Pendulum-clock, 89. A measure d
gravity, 235.

Penumbra, 420.

Perigee of moon, 406.

PeriheTta and excontricitics, theory of,
670...

Perihelion, 368. Longitude of, 495.
Passage, 496. Heat endured by
comets in, 592.

Period, Julian, 924. Of planets (App.).

Periodic time of a body revolving at the
earth's surface, 442. Of planets, how
ascertained, 486. Law of, 48. Of a
disturbed planet permanently altered,
734...

Periodical stars, 820... List of, 825.

Perspective, celestial, 114.

Perturbations, 602...

Peters, his researches on parallax, 815.

Phases of the moon explained, 416. Of
Mercury and Venus, 465. 477. Of
superior planets, 484.

Photometric scale of star magnitudes, 780.

Piazzi discovers Ceres, 505.

Pioott, variablo stars discovered by,
824...

Places, mean and true, 374. Geometric
and heliocentric, 371. 497.

Planetary nebula;, 876...

Planets, 456. Zodiacal and ultra-zo-
diacal, 457. Apparent motions, 459.
Stations and rctrogradations, 459.
Reference to sun as their center, 462.
Community of nature with the earth,
463. Apparent diameters of, 464.
Phases of, 465. Inferior and superior,
467. Transits of (.Sec Transit) Mo-
tions explained, 468. Distances, how
concluded, 471. Periods, how found,
472. Synodical revolution, 472.
Superior, their stations and rctrogra-
dations, 485. Magnitudo of orbits,
how concluded, 485. Elements of,
495. (See Appendix for Synoptic
Table.) Densities, 508. Physical
peculiarities, &e., 509... Illustration of
their relative sizes and distances, 526.

Plantamour, his calculations respecting
the double comet of Biela, 583.

Pleiades, 865. Assigned by Midler
as the central point of the sidereal
system, 861.

Plumb-line, direction of, 23. Use of, in
observation, 175.

Polar distance, 105. Point, on a mural
circle, 170. 172.

Poles, 83. Of ecliptic, 307.

Pole-star, 59. Useful for finding the
latitude, 171. Not always the same,
318. What, at epoch of the building
of the pyramids, 319.

Pores of the sun's surface, 387.

Position, angle of, 204. Micrometer, ib.

Precession of the equinoxes, 312 In

what consisting, 314... Effects, 313.

Physical explanation, 642...
Prasepe, Cancri, 865.
Priming and lagging of tides, 753.
Principle of areas, 490. Of forced

vibrations, 650. Of repetition, 198.

Of conservation of vis viva, 663.

Of collimation, 178.
Problem of three bodies, 608.
Problems in plane astronomy, 127...

309...
Projection of a star on the moon's limb,

414., note.
Projections of the sphere, 280...
Proper motions of tho stars, 852. Of

the sun, 853.
Pyramids, 319.

Radial disturbing force, 615...

Radiation, solar, on planets, 508. On
comets, 592.

Rate of clock, how obtained, 293.

Reading off, methods of, 165.

Reflexion, observations by, 173.

Refraction, 38. Astronomical and its
effects, 39, 40. Measure of, and law
of variation, 43. How detected by
observation, 142. Terrestrial, 44.
How best investigated, 191.

Repetition, principle of, 198.

Resistance of ether, 577.

Rctrogradations of planets, 459. Of
nodes. (See Nodes.)

Rhea, 548., note.

Right ascension, 108. How determined,
293.

Rings of Saturn, dimensions of, 514.
Phenomena of their disappearance,
515...Equilibrium of, 518...Multiple,
521, and Appendix. Appearance of
from Saturn, 522. Attraction of on
a point within, 735., note.

Rittenhouse, his principle of collimation,

. 178.

Ros.w, Earl of, his great reflector, 870.
882.

Rotation, diurnal, 58. Parallactic, 68.
Of planets, 609... Of Jupiter, 512.
Of fixed stars on their axes, 820.

Soros, 426.

Satellites, of Jupiter, 511. Of Saturn,
518. 547. Discovery of an eighth
(Appendix). Of Uranus, 523.552. Of
Neptune, 524. 553. Used to deter-
mine masses of their primaries, 532.
DOS

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