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Degree of meridian, how measured, 210. Egyptians, ancient, their chronology,

... Error admissible in, 215. Length 912.

of in various latitudes, 216. 221. Elements of a planet's orbit, 493. Va-
Diameters of the earth, 220, 221. Of riations of, 652... Of double star or-

planets, synopsis, Appendix. (See bits, 843. Synoptic table of planet-
also each planet.)

ary, &c., Appendix.
Dilatation of comets in receding from Ellipse, variable, of a planet, 653. Mo-
the sun, 578.

mentary or osculating, 654.
Dione, 548.

Elliptic motion a consequence of gravi-
Discs of stars, 816.

tation, 446. Laws of, 489... Their
Distance of the moon, 403. ; the sun, theoretical explanation, 491.

357.; fixed stars, 807. 812... ; polar, Ellipticity of the Earth, 221.
105.

Elongation, 341. Greatest, of Mercury
Districts, natural, in heavens, 302. and Venus, 467.
Disturbing forces, nature of, 609... Ge- Enceladus, 548., note.

neral estimation of, 611. Numerical Encke, comet of, 576. His hypothesis
values, 612. Unresolved in direc- of the resistance of the ether, 577.
tion, 614. Resolution of, in two Epoch, one of the elements of a planet's
modes, 615. 618. Effects of each orbit, 496. Its variation not inde-
resolved portion, 616... On moon, pendent, 730. Variations incident
expressions of, 676. Geometrical re- on, 731. 744.
presentations of, 676. 717.

Equation of light, 335. Of the center,
Diurnal motion explained, 58. Paral- 375. Of time, 379. Lunar, 452.
lax, 339. Rotation, 144.

Annual, of the moon, 738.
Double refraction, 202. Image micro-| Equator, 84.

meter, a new, described, 203. Co- Equatorial, 185.
met, 580. Nebulæ, 878.

Equilibrium, figure of, in a rotating
Double Stars, 833... Specimens of each body, 224.

class, 835.' Orbitual motion of, -839. Equinoctial, 97. Time, 935.
Subject to Newtonian attraction, 843. Equinox, 293. 303.
Orbits of particular, 843. Dimen- Equinores, precession of, 312. Its ef-
sions of these orbits, 844. 848. Co- fects, 313. In what consisting, 314...
loured, 851... Apparent periods af Its physical cause explained, 642...

fected by motion of light, 863. Eras, chronological list of, 926.
Dove, his law of temperature, 370. Errors, classification of, 133. Instru-

mental, 135... Their detection, 140.
Destruction of accidental ones by

taking means, 137. Of clock, how
Earth. Its motion admissible, 15. obtained, 293.

Spherical form of, 18. 22... Optical Establishment of a port, 754.
effect of its curvature, 25. Diurnal Ether, resistance of, 577.
rotation of, 52. Uniform, 56. Per-Evection of moon, 748.
manence of its axis, 57. Figuro sphe- Excentricities, stability of Lagrange's
roidal, 219... Dimensions of, 220. theorem respecting, 701.
Elliptic figure a result of theory, 229. Excentricity of earth's orbit, 354. How
Temperature of surface, how main-l ascertained, 377. Of the moon's, 405.
tained, 366. Appearance as seen Momentary perturbation of, investi-
from moon, 436. Velocity in its gated, 670. Application to lunar
orbit, 474. Disturbance by Venus, theory, 688. Variations of, in orbits
726.

nearly circular, 696. In excentric
Eclipses, 411... Solar, 420. Lunar, 421 orbits, 697. Permanent inequalities

... Annular, 425. Periodic return depending on, 719.
of, 426. Number possible in a year,
426. Of Jupiter's satellites, 538. Of

Saturn's, 549.
Ecliptic, 305... Its plane slowly vari- | Faculæ, 338.

able, 306. Cause of this variation | Faye, comet of, 584. and Appendix.
explained, 640. Poles of, 307. Li- Flora, discovery of, 505.
mits, solar, 412. Lunar, 427. Focus, upper. Its momentary change

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of place, 670, 671. Path of, in virtue | Hansen. His detection of long ine.
of both elements of disturbing force, qualities in the moon's motions, 745...
704. Traced in the case of the Harding discovers Juno, 505.
moon's variation, 706... And paral- Heat, supply of, from sun alike in
lactic inequality, 712. Circulation of, summer and winter, 368. How kept
about a mean situation in planetary up, 400. Sun's expenditure of esti-
perturbations, 727.

mated, 397. Received from the sun
Force, metaphysical conception of, 439. by different planets, 508. Endured
Forced vibration, principle of, 650.

by comets in perihelio, 592.
Forces, disturbing. See Disturbing force. Hebe, discovery of, 505.

Heights above the sea, how measured,
G.

286. Mean, of the continents, 289.

Heliocentric place, 500.
Galactic circle, 793. Polar distance, Heliometer, 201.
ib.

Hemispheres, terrestrial and aqueous, 284,
Galary composed of stars, 302. Sir Herschel, Sir Wm., discovers Uranus,

W. Herschel's conception of its form 505, and two satellites of Saturn, 548.
and structure, 786. Distribution of His method of gauging the heavens,
stars generally referable to it, 786. 793. Views of the structure of the
Its course among the constellations, Milky Way, 786. Of nebular sub-
787... Difficulty of conceiving its sidence, and sidereal aggregation, 869.
real form, 792. Telescopic analysis 874. His catalogues of double stars,
of, 797. In some directions unfathom- | 835. Discovery of their binary con-
able, in others not, 798.

nexion, 839. Of the sun's proper
Galle, Dr., 506. Finds Neptune in motion, 854. Classifications of ne-
place indicated by theory, 768.

bulæ, 868. 879. note.
Galloway, his researches on the sun's Horizon, 22. Dip of, 23. 195. Rational
proper motion, 855.

and sensible, 74, Celestial, 98. Arti-
Gasparis, Sig. De, discovers a new ficial, 163.
planet (Appendix).

Horizontal point of a mural circle, how
Gauging the heavens, 793.

determined, 175...
Gay Lussac, his aëronautic ascent, 32. Hour circles, 106.; angle, 107. ; glass,
Geocentric longitude, 503. Place, 371.
497.

Hyperion, Appendix, Saturn's satellites.
Geodesical measurements, their nature,

247...
Geography, 111, 205...
Globular clusters, 865. Their dynami- ' Iapetus, 548.

cal stability, 866. Specimen list of, Inclination of the moon's orbit, 406. Of
867.

planet's orbits disturbed by orthogo-
Golden number, 922.

nal force, 619. Physical importance
Goodricke, his discovery of variable of, as an element, 632. Momentary
stars, 821...

variation of, estimated, 633. Crite-
Gravitation, how deduced from phæno rion of momentary increase or dimi-

mena, 444... Elliptic motion a con mution, 635. Its changes periodical
sequence of, 490...

and self-correcting, 636. Applications
Gravity, center of, see Center of gravity. ! to case of the moon, 638.
Gravity diminished by centrifugal force, Inclinations, stability of, Lagrage's theo-

231. Measures of, statical, 234. rem, 639. Analogous in their per-
Dynamical, 235. Force of, on the I turbations to excentricities, 699.
moon, 433... On bodies at surface Indictions, 923.
of the sun, 440. Of other planets, Inequality. Parallactic of moon, 712.
see their names.

Great, of Jupiter and Saturn, 720...
Gregorian reform of calendar, 915... Inequalities, independent of excentri-

city, theory of, 702... Dependent

on, 719.
H.

Intercalation, 916.
Halley. His comet, 567. First notices | Iris, discovery of, 505.

proper motions of the stars, 852. Iron, meteoric, 888.

150.

| Local time, 252.

London, centre of the terrestrial hemi-
Juliar. period, 924. Date, 930. Re sphere, 284.
formation, 918.

Longitude, terrestrial, 90. How deter-
Juno, discovery of, 505.

mined, 121. 251... By chronometers,
Jupiter, physical appearance and de 255. By signals, 264. By electric

scription of, 511. Ellipticity of, 512. telegraph, 262. By shooting stars,
Belts of, 512. Gravity on surface, 265. By Jupiter's satellites, &c., 266.
508. Satellites of, 510. Seen with By lunar observations, 267... Celes-
out satellites, 543. Recommended tial, 308. Mean and true, 375. He-
as a photometric standard, 783. Ele liocentric, 500. Geocentric, 503. Of
ments of, &c. (See Synoptic Table, Jupiter's satellites, curious relations
Appendix.) :

of, 542.
Jupiter and Saturn, their mutual per- Lunation (synodic revolution of the
turbations, 700. 720...

moon), its duration, 418.

1.

K.

M.
Kater, his mode of measuring small in- Magellanic clouds, 892...

tervals of time, 150. His collimator, Magnitudes of stars, 780... Common
178.

and photometric scales of, 780... And
Kepler, his laws, 352. 487. 489. Their Appendix.
physical interpretation, 490... Maps, geographical, construction of, 273.

Celestial, 290... Of the moon, 437.
Mars, phases of, 484. Gravity on sur-

face, 508. Continents and seas of,
Lagging of tides, 753.

510. Elements (Appendix).
Lagrange, his theorems respecting the Masses of planets determined by their
stability of the planetary system, 669. satellites, 532.

satellites, 532.

By their mutual

By their
639. 701.

perturbations, 757. Of Jupiter's
Laplace accounts for the secular accele satellites, 758. Of the moon, 759.
ration of the moon, 740.

Menstrual equation, 528.
Lassell, his discovery of the satellite of Mercator's projections, 283.

Neptune, 524. Of an eighth satellite Mercury, synodic revolution of, 472.
of Saturn, Appendix. Re-discovers Velocity in orbits, 474. Stationary

two of the satellites of Uranus, 551. points of, 476. Phases, 477. Greatest
Latitude, terrestrial, 88. Parallels of, elongations, 482. Transits of, 483.

89. How ascertained, 119. 129. Rö-| Heat received from sun, 508. Phy-
mer's mode of obtaining, 248. On a sical appearance and description, 509
spheroid, 247. Celestial, 308. He- | Elements of (Appendix).
liocentric, how calculated, 500. Geo- Meridian, terrestrial, 85. Celestial, 101,
centric, 503.

Line, 87. 190. Circle, 174. Mark,
Laws of nature how arrived at, 139. 190. Arc, how measured, 213. Arcs,

Subordinate, appear first in form of lengths of, in various latitudes, 216.

errors, 139. Kepler's, 352. 487... Messier, his catalogue of nebulæ, 865.
Level, spirit, 176. Sea, 285. Strata, 287. Meteors, 898. Periodical, 900... Heights
Leverrier, 506, 507. 767.

of, 904.
Lexell, comet of, 585.

Metis, discovery of, 505.
Libration of the moon, 435. Of ap- Micrometers, 199...
- sides, 694.

Milky way. (See Galaxy, 302.)
Light, aberration of, 331. Velocity of, Mimas, 550., and note.

331. How ascertained, 545. Equa- Mira Ceti, 820.
tion of, 335. Extinction of, in tra- | Moon, her motion among the stars, 401,
versing space, 798. Distance mea Distance of, 403. Magnitude and
sured by its motion, 802... Of certain horizontal parallax, 404. Augmen-
stars compared with the sun, 817... tation, 404. Her orbit, 405. Revo-
Effect of its motion in altering appa lution of nodes, 407. Apsides, 409.
rent period of a double star, 863. Occultation of stars by, 414. Phases
Zodiacal, 897.

of, 416. Brightness of surface, 417.,

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note. Redness in eclipses, 422. Nomenclature of Saturn's satellites, 548.,
Physical constitution of, 429... Desti- note.
tute of sensible atmosphere, 431. Nonagesimal point, how found, 310.
Mountains of, 430. Climate, 431... Normal disturbing force and its effects,
Inhabitants, 434. Influence on wea 1 618. Action on excentricity and
ther, 432., and note. Rotation on perihelion, 673. Action on lunar
axis, 435. Appearance from earth, apsides, 676. Of Neptune on Uranus,
436. Maps and models of, 437. Real its effects, 775.
form of orbit round the sun, 452. Nubeculæ, major and minor, 892...
Gravity on surface, 508. Motion of Number, golden, 922.
her nodes and change of inclination Nutation, in what consisting, 321. Period,
explained, 638... Motion of apsides, 322. Common to all celestial bodies,
676... Variation of excentricity, 688 323. Explained on physical prin-
... Parallactic inequality, 712. An ciples, 648.
nual equation, 738. Evection, 748.
Variation, 705... Tides produced by,

751.
Motion, apparent and real, 15. Diurnal, Obliquity of ecliptic, 303. Produces

52. Parallactic, 68. Relative and the variations of season, 362. Slowly
absolute, 78... Angular, how mea diminishing, and why, 640.
sured, 149. Proper, of stars, 852... | Observation, astronomical, its peculiari-
Of sun, 854.

ties, 138.
Mountains, their proportion to the globe, Occultation, perpetual, circle of, 113.
29. Of the moon, 430.

Of a star by the moon, 413... Of Ju-
Mowna Roa, 32.

piter's satellites by the body, 541.
Mural circle, 168.

Of Saturn's, 549.
Olbers discovers Pallas and Vesta, 505.

His hypothesis of the partial opacity

of space, 798.
Nabonassar, era of, 926.

Opacity, partial, of space, 798.
Nadir, 99.

Oscillations, forced, principle of, 650.
Nebula, classifications of, 868.879., note. Orbits of planets, their elements (Ap-

Law of distribution, 868. Resolvable, pendix) of double stars, 843. Of
870. Elliptic, 873. Of Andromeda, comets. (See comets.)
874. Annular, 875. Planetary, 876. Orthogonal disturbing force, and its
Coloured, ib. Double, 878. Of sub effects, 616. 619.
regular forms, 881, 882. Irregular, Orthographic projection, 280.
883. Of Orion, 885. Of Argo, 887.

Of Sagittarius, 888. Of Cygnus, 891.
Nebular hypothesis, 872.
Nebulous matter, 871. Stars, 880. Palitzch discovers the variability of
Neptune, discovery of, 506. 768. Per- Algol, 821.

turbations produced on Uranus by, Pallas, discovery of, 505.
analysed, 765... Place indicated by Parallactic instrument, 185. Inequality
theory, 767. Elements of, 771... Per of the moon, 712. Of planets, 713.
turbing forces of, on Uranus, geo Unit of sidereal distances, 804. Mo-
metrically exhibited, 773. Their tion, 68.
effects, 774...

Parallar, 70. Geocentric or diurnal,
Newton, his theory of gravitation, 490... | 339. Heliocentric, 341. Horizontal,
et passim.

355. Of the moon, 404. Of the
Nodes of the sun's equator, 390. Of sun, 357. 479. 481. Annual, of stars,

the moon's orbit, 407. Passage of 800. How investigated, 805.... Of
planets through, 460. Of planetary particular stars, 812, 813. 815. Sys-
orbits, 495. Perturbation of, 620... tematic, 862.
Criterion of their advance or recess, Peak of Teneriffe, 32.
622. Recede on the disturbing orbit, Pendulum-clock, 89. A measure of
624... Motion of the moon's theory of, gravity, 235.
638. Analogy of their variations to Penumbra, 420.
those of perihelia, 699.

Perigee of moon, 406.

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824...

Perihelw and excentricities, theory of, Precession of the cquinoxes, 312 In
670...

| what consisting, 314... Effects, 313.
Perihelion, 368. Longitude of, 495. Physical explanation, 642...

Passage, 496. Heat endured by Presepe, Cancri, 865.
comets in, 592.

Priming and lagging of tides, 753.
Period, Julian, 924. Of planets (App.). Principle of areas, 490. Of forced
Periodic time of a body revolving at the vibrations, 650. Of repetition, 198.

earth's surface, 442. Of planets, how Of conservation of vis viva, 663.
ascertained, 486. Law of, 48. Of all Of collimation, 178.
disturbed planet permanently altered, Problem of three bodies, 608.
734...

Problems in plane astronomy, 127...
Periodical stars, 820... List of, 825. 309...
Perspective, celestial, 114.

Projection of a star on the moon's limb,
Perturbations, 602...

414., note.
Peters, his researches on parallax, 815. | Projections of the sphere, 280...
Phases of the moon explained, 416. Of Proper motions of the stars, 852. OI

Mercury and Venus, 465. 477. Of the sun, 853.
superior planets, 484.

Pyramids, 319.
Photometric scale of star magnitudes, 780.
Piazzi discovers Ceres, 505.
Pigott, variable stars discovered by, Radial disturbing force, 615...

Radiation, solar, on planets, 508. On
Places, mean and true, 374. Geometric comets, 592.
and heliocentric, 371. 497.

Rate of clock, how obtained, 293.
Planetary nebulæ, 876...

Reading off, methods of, 165.
Planets, 456. Zodiacal and ultra-zo | Reflerion, observations by, 173.

diacal, 457. Apparent motions, 459. | Refraction, 38. Astronomical and its
Stations and retrogradations, 459. effects, 39, 40. Measure of, and law
Reference to sun as their center, 462. of variation, 43. How detected by
Community of nature with the earth, observation, 142. Terrestrial, 44.
463. Apparent diameters of, 464. How best investigated, 191.
Phases of, 465. Inferior and superior, Repetition, principle of, 198.
467. Transits of (See Transit) Mo Resistance of ether, 577.
tions explained, 468. Distances, how Retrogradations of planets, 459. Of
concluded, 471. Periods, how found, nodes. (See Nodes.)
472. Synodical revolution, 472. Rhea, 548., note.
Superior, their stations and retrogra Right ascension, 108. How determined,
dations, 485. Magnitude of orbits, 1293.
how concluded, 485. Elements of, Rings of Saturn, dimensions of, 514.
495. (See Appendix for Synoptic Phenomena of their disappearance,
Table.) Densities, 508. Physical 515... Equilibrium of, 518... Multiple,
peculiarities, &c., 509... Illustration of 521, and Appendix. Appearance of

their relative sizes and distances, 526. from Saturn, 522. Attraction of on
Plantamour, his calculations respecting a point within, 735., note.

the double comet of Biela, 583. Rittenhouse, his principle of collimation,
Pleiades, 865. Assigned by Mädler 178.

as the central point of the sidereal Rosse, Earl of, his great reflector, 870.
system, 861.

882.
Plumb-line, direction of, 23. Use of, in Rotation, diurnal, 58. Parallactic, 68.
observation, 175.

Of planets, 509... Of Jupiter, 512.
Polar distance, 105. Point, on a mural Of fixed stars on their axes, 820.

circle, 170. 172.
Poles, 83. Of ecliptic, 307.

S.
Pole-star, 59. Useful for finding the Saros, 426.

latitude, 171. Not always the same, Satellites, of Jupiter, 511. Of Saturn,
318. What, at epoch of the building 518. 547. Discovery of an eighth
of the pyramids, 319.

(Appendix). Of Uranus, 523.552. Of
Pores of the sun's surface, 387.

Neptune, 524. 553. Used to deter-
Position, angle of, 204. Micrometer, ib. mine masscs of their primaries, 532.

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