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.
ABERRATION of light explained, 329.
Its uranographical effects, 333. Of
an object in motion, 335. How dis-
tinguished from parallax, 805. Sys-
tematic, 862.
Acceleration, secular, of moon's mean
motion, 740.
Adams, 506, 767.
Adjustment, errors of, in instruments,
136. Of particular instruments. (See
those instruments.)
Etna, portion of earth visible from, 32.
Height of, 32. note.
Agathocles, eclipse of, 933. b., and
Table of Eras, art. 926.
Air, rarefaction of, 33. Law of den-
sity, 37. Refractive power affected
by moisture, 41.
Airy, G. B., Esq., his results respecting
figure of the earth, 220. Researches
on perturbations of the earth by
Venus, 726. Rectification of the mass
of Jupiter, 757.
Albategnius, 430.
Algol, 821.
Altitude, used to find time, 129.
and azimuth instrument, 187.
-s, equal, method of, 188.
Andromeda, nebula in, 874.
Angle of position, 204. Of situation,311.
Angles, measurement of, 163. 167.
Hour, 107.
Angular velocity, law of, variation of,
350.
Anomalistic year, 384.
Anomaly of a planet, 499.
Annular nebulæ, 875.
Antarctic circle, 364. 382.
Aper of aberration, 343. Of parallax,
343. Of refraction, 343. Solar, 854.
Of shooting stars, 902. 904.
Aphelion, 368.
Apogee, 368. Of moon, 406. Period
of its revolution, 687.
Apsides, 406. Revolution of lunar, 409.
Motion of, investigated, 675. Ap-
plication to lunar, 676... Motion
of, illustrated by experiment, 692.
Of planetary orbits, 694. Libration
of, 694. Motion in orbits very near
to circles, 696. In excentric orbits,
697...
Arago, 387. 395. 776.877.
Arcs of meridian, how measured, 211.
Measures of some, 216.
Arctic circle, 364. 382.
Areas, Kepler's law of, 352..., 490.
Argelander, his researches on variable
stars, 820..., on sun's proper mo-
tion, 854.
Argo, nebulæ in, 887. Irregular star
n in constellation, 830.
Ariel, 551.
Aristillus, 430.
Ascension, right, 108. (See Right as-
cension.)
Asteroids, their existence suspected
previous to their discovery, 505.
Appearance in telescopes, 525. Gra-
vity on surface of, 525. Elements,
Appendix, Synoptic Table. Total
mass of, inconsiderable, 525. (See
Synoptic Tables.)
Astræa, discovery of, 505.
Astrometer, 783.
Astronomy. Etymology, 11. General
notions, 11.
Atmosphere, constitution of, 33... Pos-
sible limit of, 36. Its waves, 37.
Strata, 37. Causes refraction, 38.
Twilight, 44. Total mass of, 343.
Of Jupiter, 513. Of the sun, see
Sun. Of the moon, 431.
Attraction of a sphere, 446-450. (See
Gravitation.) To a spheroid, 238.
Augmentation of moon's apparent dia-
meter, 404.
Augustus, his reformation of mistakes
in the Julian calendar (919.). Era
of, 926.
Aurora Borealis, 115.
Calendar, Julian, 917. Gregorian, 914.
Calms, equatorial, 244.
Cause and effect, 439. and note.
Cavendish, his experiment, 776. h.
Australia, excessive summer tempera- Center of the earth, 80. Of the sun, 462.
Beer and Maedler, their work on the Clausen, his orbit of comet of 1843,
Belts of Jupiter, 512. Of Saturn, 514.
Bessel, his results respecting the figure
lax of 61 Cygni, 812.
Biela's comet, 579...
Biot, his aeronautic ascent, 32.
Bissextile, 932. Omar's proposal for
its periodical omission, Note (A) on
art, 926.
Bode, his (so-called) law of planetary
distances, 505. Violated in the case
of Neptune, 507.
Boguslawski, remarkable observation
of Halley's comet by, 571. note.
Bohnenberger, his principle of collima-
tion, 179.
Bond, Prof., his observations of interior
ring of Saturn, 521. His discovery
of an eighth satellite of Saturn, 548.
Borda, his principle of repetition, 198.
Bouvard, his suspicion of extraneous
influence on Uranus, 760.
Brewster, Sir D., his polarizing eye-
piece, 204. d.
Casar, his reform of the Roman calen-
dar, 917.
Clock, 151. Error and rate of, how
found, 253.
Clockwork applied to equatorial, 186.
Clouds, greatest height of, 34. Magel-
lanic, 892...
Clusters of stars, 864... Globular, 867.
Irregular, 869.
Collimation, line of, 185.
Collimator, floating, 178. Bohnen-
berger's, 179.
Coloured stars, 851...
Colson, his maps, 284.
Colures, 307.
Comets, 554.
Seen in day-time, 555.
590. Tails of, 556...566. 599. Ex-
treme tenuity of, 558. General de-
scription of, 560. Motions of, and
described, 561... Parabolic, 564.
Elliptic, 567... Hyperbolic, 564. Di-
mensions of, 565. Of Halley, 567...
Of Cæsar, 573. Of Encke, 576. Of
Biela, 579. Its subdivision into two,
580. Of Faye, 584. Of Lexel,
585. Of De Vico, 586. Of Bror-
sen, 587. Of Peters, 588. Synop-
sis of elements (Appendix). In-
crease of visible dimensions in re-
ceding from the sun, 571. 580. Great,
of 1843, 589... Its supposed identity
with many others, 594... Interest at-
tached to subject, 597. Cometary
statistics, and conclusions therefrom,
601. Conclusions from the phæno-
mena of their tails, 570. Possible
cause of their acceleration of period,
570. Heat sustained by, 592. Prin-
cipal discoverers of, 597. Periodic,
form two distinct families, 601. a.
Of 1680, 573. Of 1556, 574.
d'Arrest, 601. b.
Commensurability (near) of mean mo-
tions; of Saturn's satellites, 550. Of
Uranus and Neptune, 669. and
note. Of Jupiter and Saturn, 720.
Earth and Venus, 726. Effects of,
Compensation of disturbances, how ef-
fected, 719. 725.
Compression of terrestrial spheroid,
Configurations, inequalities depending
on, 655...
Conjunctions, superior and inferior,
469. 473. Perturbations chiefly pro-
duced at, 713.
Consciousness of effect when force is
exerted, 439.
Constellations, 60. 301. How brought
into view by change of latitude, 52.
Rising and setting of, 58.
Copernican explanation of diurnal mo-
tion, 76. Of apparent motions of
sun and planets, 77.
Correction of astronomical observa-
tions, 324... -8. Uranographical
summary, view of, 342... Order of
application of, 345.
Culminations, 125. Upper and lower,
Cycle, of conjunctions of disturbing
and disturbed planets, 719. Meto-
nic, 926. Callippic, ib. Solar, 921.
Lunar, 922. Of indictions, 923. Of
eclipses, 426.
Cyclones, 245. a.
Darkening glasses, 204. e.
Dates, Julian and Gregorian, interval
between, how computed, 927...
Dawes, Rev. W. R., his mode of ob-
serving solar spots, 204. e. His dis-
covery of the sun's interior enve-
lope, 389. a. His observation of
interior ring of Saturn, 521. His
discovery of bright spots on Jupi-
ter's belts, 512. Of an eighth satel-
lite of Saturn, 548.
Day, solar, lunar, and sidereal, 143.
Ratio of sidereal to solar, 305. 909.
911. Solar unequal, 146. Mean
ditto, invariable, 908. Civil and as-
tronomical, 147. Intercalary, 916.
Days elapsed between principal chro-
nological eras, 926. Rules for reck-
oning between given dates, 927. Of
week not the same over the globe,
257. And nights, their inequality
explained, 365.
Declination, 105. How obtained, 295.
Parallels of, 113.
Definitions, 82.
Degree of meridian, how measured, 210.
Error admissible in, 215. Length
of in various latitudes, 216. 221.
Density of earth, how determined, 776.
a. b.
Densities of sun and planets, 508. b.
(See also Synoptic Table.)
Diameters of the earth, 220, 221. Of
planets, synopsis, Appendix. (See
also each planet.)
Dilatation of comets in receding from
the sun, 578.
Diminution of gravity at equator, 231.
Diome, 548.
Dip of horizon, 23.
sector, 18, 19.
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, 455. Of sun on
moon, 606. Nature of, 609... Ge-
neral estimation of, 611. Nume-
rical values, 612. Unresolved in
direction, 614. Resolution of, in
two modes, 615. 618. Effects of
each resolved portion, 616... On
moon, expressions of, 676. Geo-
metrical representations of, 676.717.
Diurnal motion explained, 58. Pa-
rallax, 339. Rotation, 144.
Double refraction, 202. Image mi-
crometer, a new, described, 203. Co-
met, 580. Nebulæ, 878.
Double Stars, 833... Specimens of
each class, 835. Orbital motion
of, 839. Subject to Newtonian at-
traction, 843. Orbits of particular,
843. Dimensions of these orbits,
844.848. Coloured, 851... Appa-
rent periods affected by motion of
light, 863.
Dove, his law of temperature, 370. Of
rotation of winds, 245. a.
Drainage basins, 289.
Equatorial instrument, 84. 112.
calms, 224.
Equilibrium, figure of, in a rotating
body, 224. Exemplified by an ex-
periment, 225.
Equinoctial, 97. 113. Time, 148. 935.
Equinox, 293. 303. 307. 362.
Equinoxes, precession of, 318. Its ef-
fects, 313. In what consisting, 314...
Its physical cause explained, 642...
Eras, chronological list of, 926.
Earth. Its motion admissible, 15.
Spherical form of, 18. 22... Optical
effect of its curvature, 25. Diurnal
rotation of, 52. Uniform, 56. Per-Erratic stars, 297.
manence of its axis, 57. Figure
spheroidal, 207. 219... Dimensions
of, 209, 210. 220. Elliptic figure a
result of theory, 229. Temperature
of surface, how maintained, 336.
Appearance as seen from moon, 436.
Velocity in its orbit, 474. Dis-
turbance by Venus, 726. Density
of, 776. a, b. Solid content of, 776. l.
Eclipses, 411... Solar, 420. Lunar,
421... Annular, 425. Periodic re-
turn of, 426. Number possible in a
year, 426. Of Jupiter's satellites,
Of Saturn's, 549. Total
of sun, phænomena of, 395. Ancient,
their use in fixing dates, 933...
Ecliptic, 305... Its plane slowly vari-
able, 306. Cause of this variation
explained, 640. Poles of, 307. Li-
mits, solar, 412. Lunar, 527. Ob-
liquity of, 305, 306.
Egyptians, ancient, 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 gra-
vitation, 446. Laws of, 489... Their
theoretical explanation, 491.
Ellipticity of the Earth, 208. 221.
Elongation, 331. 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.
Annual, of the moon, 738. Men-
strual, of the sun, 528.
Errors, classification of, 133. Instru-
mental, 135... Of adjustment, 136.
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.
Evection of moon, 748.
Evolute of ellipse, 219, 220.
Excentricities, stability of Lagrange's
theorem respecting, 701.
Excentricity in a divided circle, how
eliminated, 141. Earth's orbit, 354.
How ascertained, 377. Of the moon's,
405. Momentary perturbation of,
investigated, 670. Application to
lunar theory, 688. Variations of, in
orbits nearly circular, 696. In ex-
centric orbits, 697. Permanent in-
equalities depending on, 719.
Faye, comet of, 584. and Appendix.
Field of view, 160.
Fixed stars.
See Stars.
Fizeau, his measure of the velocity of
light, 545.
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 pa-
rallactic inequality, 712. Circulation
of, about a mean situation in planet-
ary perturbations, 727.
Force, metaphysical conception of, 439.
Forced vibration, principle of, 650.
Forces, disturbing. See Disturbing
Foucault, his pendulum experiment,
245. c. His gyroscope, 245. h.
Friction as possibly a source of the sun's
heat, 400. 905. a...
Galactic circle, 793. Polar distance, ib.
Galary 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 unfa-
thomable, in others not, 798.
Galle, Dr., 506. Finds Neptune in
place indicated by theory, 768. First
notices the interior ring of Saturn,
Galloway, his researches on the sun's Heights above the sea, how measured,
286. Mean of the continents, 289.
Heliocentric place, 372. 498. 500.
Heliometer, 201.
Helioscope, 204. e.
Gasparis, Sig. De, discovers a new
planet (Appendix).
Gauging the heavens, 793.
Geocentric longitude, 503. Place, 371.
497.
Geodesical measurements,
ture, 247.
Geography, 111. 129... 205...
Glasses, darkening, 204. c.
Globe, artificial, an experiment with,
245.j.
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 phæno-
mena, 444... Elliptic motion a con-
sequence of, 490...
Gravity, center of, see 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
Hemispheres, terrestrial and aqueous,
Hencke discovers Hebe and Astræa,
505.
Henderson, his determination of the
parallax of a Centauri, 807.
Herschel, Sir Wm., discovers Uranus,
595, and two satellites of Saturn,
548. His method of gauging the
heavens, 793. Views of the struc-
ture of the Milky Way, 786. Of
nebular subsidence, and sidereal ag-
gregation, 869. 874. His catalogues
of double stars, 835. Discovery of
their binary connexion, 839. Of
the sun's proper motion, 854. Clas-
sifications of nebulæ, 868. 879. note.
Herschel, Miss C., comets discovered by,
597. Nebula discovered by, 874.
Hind, his calculation of the return of
comets, 574. Classification of comets,
601.
Habitability of the moon, 436. a, b.
Hadley, his sextant, 194. His expla
nation of the trade winds. (See
Winds.)
Halley. His comet, 567. First no- Iapetus, 548.
|