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INIH:\ TO VOL. I. 



[ ASTRONOMY. 



Comet*, their orbit*, uilt, Ac.. 960. 

 Conjunction, planetary, defined, 918. 

 Conttrll.tioni (we Fulio Plates, illustrat- 

 ing (be northern and southern sy.tems, 



i, .1 



Constellation* and filed Mara. 958. 

 Coottellalion*, northern, 9.'>9. 

 Constellations of ihe lodiac, 958. 

 Constellation*, aouthern, 'Ji'J. 

 Coperniemn sy.tem, 9(2. 

 Corona Bo real ii, 960. 

 Crater* of the moon, 939. 

 Culmination defined, 913. 

 Cygnus, 960. 



D'AsT's comet, 963. 



Day, tolar and sidereal, length of, 922. 



Day, aolar, lidereal, astronomical, and 



artificial, defined. 919. 

 Declination defined, 917. 

 Definition* of term* in astronomy, 916. 

 Degree, length, and measurement of a. 920. 

 Degree, length of, at various places, 92'2. 

 Degree* of latitude and longitude, length 



of, at various place*, 922. 

 Density of the earth, C J21. 

 Di*c of a planet defined, 918. 

 Due of the sun, 927. 

 Distance, lenith, to measure the, 996. 

 Distances of the planets (see Note at foot 



of page), 92>i. 

 Donati'* comet. 972. 

 Double stars, 952. 



EARTH an oblate spheroid, 920. 



Earth, atmosphere of the, 924. 



Earth, axis of, defined, 914. 



Earth, density of the, 921. 



Earth, distance of from the sun, 926. 



Earth, equatorial circumference of the, 



922. 



Earth, figure of the. 919. 

 Earth, force of gravity of the, 924. 

 Earth, inclination of the axi* of the, 923. 

 Earth, polar and equatorial diameter of 



the, 921. 



Earth, proofs of the rotundity of the, 919. 

 Earth, rate of the motion of in space, 



923, 926. 



Earth, revolution of the, 923. 

 Earth, rotation of the. 922. 

 Earth, sun, and planeU, comparative 



volume*, Ac., of tin-, '.'2>i, 927. 

 Earth's axis, rotation round the, 933. 

 Eclipse, calculation of an, 975. 

 Eclipse, corona observed during a solar, 



983. 

 Eclipse, darkneu during a solar, 983. 



, effects of the earth'* atmosphere 



during an, 974. 

 Eclipse, graphical construction of a lunar, 



976. 



Eclipses, how occasioned, 972. 

 Eclipse, lunar, prediction, duration, fee., 



of. 975. 

 Eclipse of the sun, prediction, calculation, 



Ac., of an, 979. 



Eclipse, partial, of the moon, 973. 

 Eclipse, phenomena, observed during a 



solar, 983. 



Eclipse, solar, calculation of, 979, tl teg. 

 Eclipse, solar, magnitude of, 978. 

 Ectipae, solar, red flame *een during one, 



Bdipse* and ocraltations, 972. 

 Edipse* and photography, 164, 984. 



, dimension of the shadow in, 9;3 

 Eelip.es, lunar. 972. 

 Rdipae* o( Jupiter'* satellite*. 918. 

 Krlipwi. solar, annular, Ac., 982. 



-'16. 



. n'ihi|uity of the, 923. 

 Elliptic system of planetary motion, 987. 

 Ellipticity of Ihe earth', figure, 921. 

 Elongation of a p'.anct, 43. 



Encke'a comet, 971. 



theory of the ancients, 910. 



Equator defined. 916. 



Equatorial diameter of the earth, 921. 



Equatorial, the. 999. 



Equinoctial colure defined, 923. 



Equinoctial drtiiird, '.Hi;. 



Equinoxes, precession of the, 931. 



" Establishment of the port." a term ap- 

 plied to the determination of the high 

 water at a port, 989. 



Erection of the moon, 937. 



PACULX on the sun's disc, 927. 



Faye's comet, 963. 



Figure of the earth, 919. 



Fixed star* and constellations, 958. 



GALVANISM and astronomical registra- 

 tion, 1001. 



Gambart's comet, 962. 



Geocentric latitude, 1029. 



Geocentric zenith, the. 1029. 



Gravitation, and the planetary orbits, 

 motioas, Ac., 985. 



Gravitation, laws of, 985. 



Gravitation, nature of, 985. 



Gravity, force of, on the surface of th; 

 earth, 924. 



II ALLEY'* comet, 961. 

 Harvest moon, 937. 

 Hercules, cluster of, 955. 

 Herschel's telescope, 994. 

 High-water, what causes, 939. 

 Ili-inry of astronomy, 913. 

 Horizon defined, 917. 

 Horizontal parallax. 1028. 

 Hyades, cluster of, 955. 



ILLUMINATION, defective, of the moon, 

 corrections for, in observations, 1030. 



Inclination of an orbit defined, 918. 



Instruments, astronomical, uses, precau- 

 tions in using, Ac. (see name of each), 

 989, el teg. 



Juso (*ee Asteroids), 946. 



Jupiter, atmosphere of, 947. 



Jupiter, belts of, 947. 



Jupiter, disc of, 947. 



Jupiter, eclipses of the satellites of, 918. 



Jupiter, ellipticity of, 947. 



Jupiter, rotation of, 947. 



Jupiter, satellites of, 918. 



Jupiter, telescopic appearance of, 947. 



KEPLER'S laws, 944. 



Kepler's laws and gravitation, 986. 



LATITUDE defined, 917. 



Latitude, geocentric. 1029. 



Laws of Kepler, '.III. 



Lenses for astronomical instruments. 990. 



Lenses, principle* of (see also Index, p. 



1219), 990. 



Level, corrections of, formulre for, 1005. 

 Level of instruments, error, and correction 



of the, 1004. 



Level, use of the, 996, 997. 

 Libration of the moon. 935. 

 Light, aberration of, 931. 

 Light, zodiacal, the. 930. 

 Longitude defined, 917. 

 Longitude, determination of terrestrial, 



1019. 

 Longitude determined by the eclipses of 



Jupiter's satellite*. 94rt. 

 Longitude determined by lunar occulia- 



tions, 984. 

 Longitude determined by tranit of the 



moon, and moon culminating stars, 



1019. 

 Longitudes, examples illustrating the 



method of finding. 1021. 



Lunar eclipses, 972. 



Lunar horizontal parallax, 1023. 



Lunar nutation, 933. 



Lyra, 9tiO. 



MACULA on the sun's disc, 927. 



Mafrrllamc clouds, 955. 



Magnitude, degree* of, in respect to tne 



stars, 950. 



Man, apparent diameter of, 9lu. 

 Mara, atmonphere of, 9 16. 

 Mars, density of, 946. 

 M irs. cli.iin/ter of, 946. 

 Mara, ellipticity of, 946. 

 Mara, rotation of, 946. 

 Mars, seasons of, 946. 

 Mars, snow, Ac., observed on. 9 IS. 

 Mars, telescopic appearance of, 946. 

 Mara, volume of, 946. 

 Masses of the planets, 926, 988. 

 Mercury, 941, 945. 

 Mercury, phases of, 945. 

 Meridian, methods of determining the 



length of an arc of, 921. 

 Meridian, or Mural Circle, 1023. 

 Meridians defined, 917. 

 Micrometer, microscopic indication of, 



converted into the arc of a 



1027. 



Micrometer-observation, errors in, 1001. 

 Micrometer, the, 998. 

 Milky Way, the, 951. 

 Moon, annual equation of the, 937. 

 Mo,,n, apsides of th, 

 Moon, crater* of tin-. 

 Moon, defective illumination of. cor- 

 rections for, in observations, ln.'.it. 

 Moon, earth-light illuminating the, 932. 

 Moon, eclipses of the, 9T2. 

 Moon, evection of the, 937. 

 Moon, harvest, 937. 

 Moon, height of the mountain* of the, 



939. 



Moon, libration of the, 935. 

 Moon, mountain* of the, 938. 

 M> 'u, occultation of stars by the, 935, 



981. 



Moon, opacity of the, 935. 

 Moon, orbit of the. '.Gil. 

 Moon, parallax of the, 936. 

 Moon, partial rclip>e of the, 973. 

 Moon, p-ith of, in the heavens, 936. 

 Moon, phases of the, 9.'J. r >. 

 Moon, physical constitution of the, 938. 

 Moon, rotation of, on her axis, 935. 

 Moon, telescopic appearance of the, 938. 

 Moon, variation of the, 937. 

 Moon, volcanoes of the, 938. 

 Moon's motion in space, 937. 

 Motion of the sun in its orhit, 924. 

 Motion of the sun, irregularities of the, 



924. 

 Mountains of the moon, height, Ac., of 



the, 939. 

 Mural Circle, how to take observations by 



the, 1025. 

 Mural Circle, the, 1023. 



NEBULA, 955. 



Nebulas, annular and cometary, 957. 



Nebulae, double, 957. 



Nebula;, ellipticity of. 957. 



Nebulie. globular, 957. 



Nebula;, nature of, 957. 



Nebula:, resolution of, 957. 



Nebulie. theories of, 957. 



Nebulae, various, 956. 



Neptune discovered inductively, in accord- 

 ance with the laws of gravitation and 

 planetiry perturbation. 



Neptune, satellite, Ac., of, 949. 



Nodes of an orbit defined, 918. 



Nutation, lunar, 933. 



Nutation of the earth's axis, 933. 



Nutation, solar, 933. 



