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- planets, synopsis, Appendix. (See bits, 843. Synoptic table of planet- ary, &c., Appendix. mentary or osculating, 654. Elliptic motion a consequence of gravi- tation, 446. Laws of, 489... Their 357.; fixed stars, 807. 812... ; polar, Ellipticity of the Earth, 221. Elongation, 341. Greatest, of Mercury neral estimation of, 611. Numerical Encke, comet of, 576. His hypothesis Equation of light, 335. Of the center, Annual, of the moon, 738. meter, a new, described, 203. Co- Equatorial, 185. Equilibrium, figure of, in a rotating class, 835.' Orbitual motion of, -839. Equinoctial, 97. Time, 935. fected by motion of light, 863. Eras, chronological list of, 926. mental, 135... Their detection, 140. taking means, 137. Of clock, how Spherical form of, 18. 22... Optical Establishment of a port, 754. nearly circular, 696. In excentric ... Annular, 425. Periodic return depending on, 719. Saturn's, 549. able, 306. Cause of this variation | Faye, comet of, 584. and Appendix. of place, 670, 671. Path of, in virtue | Hansen. His detection of long ine. mated, 397. Received from the sun by comets in perihelio, 592. Heights above the sea, how measured, 286. Mean, of the continents, 289. Heliocentric place, 500. Hemispheres, terrestrial and aqueous, 284, W. Herschel's conception of its form 505, and two satellites of Saturn, 548. nexion, 839. Of the sun's proper bulæ, 868. 879. note. and sensible, 74, Celestial, 98. Arti- Horizontal point of a mural circle, how determined, 175... Hyperion, Appendix, Saturn's satellites. 247... cal stability, 866. Specimen list of, Inclination of the moon's orbit, 406. Of planet's orbits disturbed by orthogo- nal force, 619. Physical importance variation of, estimated, 633. Crite- mena, 444... Elliptic motion a con mution, 635. Its changes periodical and self-correcting, 636. Applications 231. Measures of, statical, 234. rem, 639. Analogous in their per- Great, of Jupiter and Saturn, 720... city, theory of, 702... Dependent on, 719. Intercalation, 916. proper motions of the stars, 852. Iron, meteoric, 888. 150. | Local time, 252. London, centre of the terrestrial hemi- Longitude, terrestrial, 90. How deter- mined, 121. 251... By chronometers, scription of, 511. Ellipticity of, 512. telegraph, 262. By shooting stars, of, 542. moon), its duration, 418. 1. K. M. tervals of time, 150. His collimator, Magnitudes of stars, 780... Common and photometric scales of, 780... And Celestial, 290... Of the moon, 437. face, 508. Continents and seas of, 510. Elements (Appendix). satellites, 532. By their mutual By their perturbations, 757. Of Jupiter's Menstrual equation, 528. Neptune, 524. Of an eighth satellite Mercury, synodic revolution of, 472. two of the satellites of Uranus, 551. points of, 476. Phases, 477. Greatest 89. How ascertained, 119. 129. Rö-| Heat received from sun, 508. Phy- Line, 87. 190. Circle, 174. Mark, Subordinate, appear first in form of lengths of, in various latitudes, 216. errors, 139. Kepler's, 352. 487... Messier, his catalogue of nebulæ, 865. of, 904. Metis, discovery of, 505. Milky way. (See Galaxy, 302.) 331. How ascertained, 545. Equa- Mira Ceti, 820. of, 416. Brightness of surface, 417., UU note. Redness in eclipses, 422. Nomenclature of Saturn's satellites, 548., 751. 52. Parallactic, 68. Relative and the variations of season, 362. Slowly ties, 138. Of a star by the moon, 413... Of Ju- piter's satellites by the body, 541. Of Saturn's, 549. His hypothesis of the partial opacity of space, 798. Opacity, partial, of space, 798. Oscillations, forced, principle of, 650. Law of distribution, 868. Resolvable, pendix) of double stars, 843. Of Of Sagittarius, 888. Of Cygnus, 891. turbations produced on Uranus by, Pallas, discovery of, 505. Parallar, 70. Geocentric or diurnal, 355. Of the moon, 404. Of the the moon's orbit, 407. Passage of 800. How investigated, 805.... Of Perigee of moon, 406. 824... Perihelw and excentricities, theory of, Precession of the cquinoxes, 312 In | what consisting, 314... Effects, 313. Passage, 496. Heat endured by Presepe, Cancri, 865. Priming and lagging of tides, 753. earth's surface, 442. Of planets, how Of conservation of vis viva, 663. Problems in plane astronomy, 127... Projection of a star on the moon's limb, 414., note. Mercury and Venus, 465. 477. Of the sun, 853. Pyramids, 319. Radiation, solar, on planets, 508. On Rate of clock, how obtained, 293. Reading off, methods of, 165. diacal, 457. Apparent motions, 459. | Refraction, 38. Astronomical and its their relative sizes and distances, 526. from Saturn, 522. Attraction of on the double comet of Biela, 583. Rittenhouse, his principle of collimation, as the central point of the sidereal Rosse, Earl of, his great reflector, 870. 882. Of planets, 509... Of Jupiter, 512. circle, 170. 172. S. latitude, 171. Not always the same, Satellites, of Jupiter, 511. Of Saturn, (Appendix). Of Uranus, 523.552. Of Neptune, 524. 553. Used to deter- UU 2 |