ASTRONOMY.] 



INDEX TO VOL. I. 



1249 



OnLiauiTY of the ecliptic, 923. 

 Observations, errors incidental in, and 



corrections for, 1001, et seq. 

 Occultations of stars by the moon, 935, 



984. 



Opposition, planetary, denned, 918. 

 Orbit of a planet denned, 918. 

 Orbit of the moon, 936. 

 Orbit of the sun, 924. 

 Orbits of comets, 960. 

 Orbits of comets, tables of, observed for 



the last two thousand years, 1031 



1034. 

 Orbits of planets elliptical, whilst those of 



comets are parabolic, &c., 960. 

 Orion, constellation of, 959. 

 Orion, nebula of, 956. 



PALLAS (see Asteroids), 946. 

 Parabolic orbits of comets, 9GO. 

 Parallax, horizontal, 1028. 

 Parallax, nature of the. 926. 

 Parallax of the heavenly bodies, how ob- 

 tained, 926. 



Parallax of the moon, 936. 

 Parallax of the sun. recent discoveries 



respecting the (see Editorial Note at foot 



of the page), 926. 

 Partial eclipse of the moon, 973. 

 Pegaros, 959. 

 Pendulum, vibration of, at the equator 



mud poles, 924. 



Pendulum, vibration of, in a day, 923. 

 Penumbra in eclipses, 973. 

 Perigee denned, 918. 

 Perihelion defined, 918. 

 Perseus, 959. 

 Perseus, cluster of, 955. 

 Personal equation of observers, 1001. 

 Perturbations of the planetary motions, 



988. 



Phases of Mercury, 941, 915. 

 Phases of the moon, 935. 

 Phases of the superior planets, 943. 

 Phases of Venus, 941, 945. 

 Plane of an orbit defined, 918. 

 Planet, elongation of a, 943. 

 Planetary astronomy, 940. 

 Planetary motion and gravitation, 985. 

 Planetary motion, and the laws of Kepler, 



986. 



Planets, 940. 

 Planets, distance of, from the sun, as 



affected by the new value of solar 



parallax (see Note at foot of the page), 



926. 

 Planets, masses of the (see also Note at 



page 926), 988. 

 Planets, motion of the, 940. 

 Planets, mutual effect of their masses in 



producing perturbations, 988. 

 PlaneU, perturbations of the, 988. 

 Planets, phases of the superior, 943. 

 Planets, retrograde motion of, 941, 943. 

 Planets, telescopic appearance of the, 



945. 



Pleiades, cluster of. 955. 

 Polar diameter of the earth, 921. 

 Pole-star, the, 959. 

 Pollux and Castor, 959. 

 Practical astronomy, 989. 

 Priesepc, cluster of, 955. 

 Precession of the equinoxes, 931. 

 Prediction, duration, &c., of a lunar 



eclipse, 975. 

 Procyon, 959. 

 Ptolemaic system, 942. 



REPEATING circle, the, 994. 



Retrograde motion of some planets, 911, 



943. 



Revolution of the earth, 923. 

 Rigel, 959. 

 Right ascension calculated by transits, 



illustrated, 1017. 



VOL. I. 



Right ascension defined, 917. 



Right ascension, determination of, by the 

 transit instrument, 1015. 



Rings of Saturn, 948. 



Rising and setting, 919. 



Rosse's, Lord, telescope, 957. 



Rotation of Jupiter, 947. 



Rotation of Mars, 946. 



Rotation of Saturn, 948. 



Rotation of the earth, 922. 



Rotation of the earth generates a centri- 

 fugal force, 988. 



Rotation of the earth, proofs of the, 922. 



Rotation of the earth, rate of at the equa- 

 tor, &c., 923. 



Rotation of the earth, time occupied in 

 the, 922 



Rotation of the moon on her axis, 935. 



Rotation of Venus, 945. 



Rotation, stellar, defined, 918. 



SATELLITES of Jupiter, 948. 



Satellites of Saturn, 949. 



Satellites, &c., of Uranus, 949. 



Saturn, rings of, 948. 



S .turn, satellites of, 949. 



Seasons, cause of the, 930. 



Seasons, unequal length of the. 926. 



Setting and rising, 919. 



Shadow of eclipses, 973. 



Sidereal day, 919. 



Sidereal day, length of a, 922. 



Sidereal year, length of the, 923. 



Signs of the zodiac denned, 916. 



Sirius, 959. 



Solar atmosphere, the existence of a, 

 934. 



Solar day, appirent, 919. 



Solar day, length of a, 922. 



Solar day, mean. 919. 



Solar eclipses, 978. 



Solar nutation. 933. 



Solar spot of July, 1862, 934. 



Solar spots, 927. 



Solar spots, nature and cause of, 928. 



Solstices defined, 923. 



Solstitial colure defined, 923. 



Spectrum analysis revealing the physical 

 constitution of the sun, 934. 



Spica Virginis,'960. 



Spots on the sun's disc, nature and cause 

 of, 927, 928. 



Stars, binary systems of, 953. 



Stars, brilliancy and magnitude of, 950. 



Stars, catalogue and number of, 951. 



Stars, clusters of (see also Nebulce), 955. 



Stars, colour of, 953. 



Stan, double, 952. 



Stars, fixed, number and magnitude of, 

 958. 



Stars, luminosity of, 952. 



Stars, motion of the, 952. 



Stars, nature and species of, 952. 



Stars, periodic and variable, 954. 



Stars, temporary, 954. 



Stars, variable, 953. 



Stellar astronomy, 950. 



Sun, the, 924. 



Sun, and distances of the planets (see 

 Note at foot of the page), 926. 



Sun, bulk of the, 926. 



Sun, diameter of the, 926. 



Sun, disc of the, 927. 



Sun, distance of the, 926. 



Sun, eclipses of the, 978. 



Sun, luminous envelope of the, 929. 



Sun, motion of the, in its orbit, 924. 



Sun, physical constitution of the, 929. 



Sun, physical constitution of the, as dis- 

 covered by the spectrum analysis, 934. 



Sun, solid mass of the, 927. 



Sun, spots on the disc of the, 927. 



Sun, telescopic appearance of the, 927. 



Sun, the surface of, in a state of incan- 

 descence, 934. 



Sun, volume of the, 926. 



TABLES of elements of the comets, ob- 

 served for the last two thousand years, 



10311034. 

 Tables of observed and corrected colli- 



mation, 1003. 

 Tables of the length of a degree of latitude 



and longitude, radius vector, angle of 



vertical, &c., 922. 

 Telescope zenith, the, 1030. 

 Telescopes, astronomical (see also Index, 



p. 1219), 991. 

 Telescopes, reflecting (see also Index, 



p. 1219), 992. 

 Telescopes, refracting and achrom itic 



(see also Index, p. 1219), 991, 9J2. 

 Theodolite, the, 996. 

 Tidal-wave, height of the, 9ti9. 

 Tides, atmospheric, 989. 

 Tides, cause of the, 988. 

 Time, method of finding the, 1013. 

 Transit-clock, 1001. 

 Transit-clock errors, 1016. 

 Transit instrument, the, 1000. 

 Transit, method of observing a, 1001. 

 Transit micrometer, corrections for errors 



in using the, 1006. 

 Transit observation, tables illustrating the 



correction, &c., of, 1U07, et eq. 

 Transit observations, method of recording j 



at Greenwich, 1018. 

 Transit of Venus and the solar parallax. 



926. 



Transits, observations of, illustrated, 1017, 

 Tropical year, length of the, 923. 

 Tropics defined, 917. 

 Tjcho Brahe's planetary system, 942. 



URANUS, satellites, ic., of, 919. 

 Ursa Major, constellation of, 959. 

 Ursa Minor, constellation of, 95U. 



VARIABLE stars, 953. 



Variation of the moon, 937. 



Vega, 900. 



Venus, apparent diameter of, 946. 



Venus, density of, 946. 



Venus, diameter of, 946. 



Venus, distance from the earth of, 941. 



Venus, irregular apparent motion of, 940. 



Venus, phases of, 941, 945. 



Venus, rotation of, on its axis, 945. 



Venus supposed to possess an atmo- 

 sphere, 946. 



Venus, transit of, affords a means of dis- 

 covering the solar parallax, 926. 



Venus, volume of, 946, 



Vesta (see Asteroids), 946. 



Volcanoes, extinct, of the moon, 938. 



Voltaic electricity, and astronomical re- 

 gistration, 1001. 



WAVKS, tidal, of the sea and atmosphere. 

 989. 



Weather prediction, falsity of, in connec- 

 tion with lunar phases, 989. 



Weight of bodies, ratio of, at the equator 

 and poles, 924. 



YKAR, sidereal, defined, 919. 

 Year, solar, defined, 919. 

 Year, tropical, denned, 919. 

 Years, sidereal and tropical, length of the, 

 923. 



ZENITH distance, instances of determina- 

 tion of the, by the Transit Circle, 1027. 

 Zenith dist mce, to measure the, 9'J6. 

 Zenith, geocentric, the, 1029. 

 Zenith. telescope, the, 1030. 

 Zodiac, constellations of the, 953. 

 Zodiac, signs of, defined, 'Jill. 

 Zodiacal light, the, 930. 

 Zones defined, 917. 



70 



