A Text-Book of Astronomy

by George C. Comstock

A List of Stars for Time Observations

See [§ 20].

Name.	Magnitude.	Right Ascension.		Declination.
		h.	m.	°
β Ceti	2	0	38.6	-18.5
η Ceti	3	1	3.6	-10.7
α Ceti	3	2	57.1	+3.7
γ Eridani	3	3	53.4	-13.8
Aldebaran	1	4	30.2	+16.3
Rigel	0	5	9.7	-8.3
κ Orionis	2	5	43.0	-9.7
β Canis Majoris	2	6	18.3	-17.9
Sirius	-1	6	40.7	-16.6
Procyon	0	7	34.1	+5.5
α Hydræ	2	9	22.7	-8.2
Regulus	1	10	3.0	+12.5
ν Hydræ	3	10	44.7	-15.7
ϵ Corvi	3	12	5.0	-22.1
γ Corvi	3	12	10.7	-17.0
Spica	1	13	19.9	-10.6
ζ Virginis	3	13	29.6	-0.1
α Libræ	3	14	45.3	-15.6
β Libræ	3	15	11.6	-9.0
Antares	1	16	23.3	-26.2
α Ophiuchi	2	17	30.3	+12.6
ϵ Sagittarii	2	18	17.5	-34.4
δ Aquilæ	3	19	20.5	+2.9
Altair	1	19	45.9	+8.6
β Aquarii	3	21	26.3	-6.0
α Aquarii	3	22	0.6	-0.8
Fomalhaut	1	22	52.1	-30.2

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INDEX

The references are to section numbers.

• Absorption of starlight, [225].
• Absorption spectra, [87].
• Accelerating force, [35].
• Adjustment of observations, [2].
• Albedo of moon, [97].
  • of Venus, [148].
• Algol, [205].
• Altitudes, [4], [21].
• Andromeda nebula, [214].
• Angles, measurement of, [2].
• Angular diameter, [7].
• Annular eclipse, [64].
• Asteroids, [156].
• Atmosphere of the earth, [49].
  • of the moon, [103].
  • of Jupiter, [139].
  • of Mars, [153].
• Aurora, [51].
• Azimuth, [5], [21].
• Biela's comet, [181].
• Bode's law, [134], [232].
• Bredichin's theory of comet tails, [180].
• Calendar, O. S. and N. S., [61].
• Capture of comets and meteors, [176].
• Canals of Mars, [154].
• Celestial mechanics, [32].
• Changes upon the moon, [108].
• Chemical constitution of sun, [116].
• • of stars, [210].
• Chromosphere, the sun's, [124].
• Chronology, [59].
• Classification of stars, [212].
• Clocks and watches, [74].
  • sidereal clock, [12].
• Collisions with comets, [183].
• Colors of stars, [209].
• Comets, general characteristics, [158]-[164].
  • development of, [179], [181].
  • groups, [177].
  • orbits, [161].
  • periodic, [176].
  • spectra, [182].
  • tails, [180].
• Comets and meteors, relation of, [175].
• Conic sections, [38].
• Constellations, [184].
• Corona, the sun's, [123].
• Craters, lunar, [105].
• Dark stars, [201].
• Day, [52], [62].
• Declination, [21].
• Development of comet, [179].
• • of moon, [241].
  • of nebulæ, [245].
  • of stars, [242], [244].
  • of sun, [228].
  • of universe, [226].
• Distribution of stars and nebulæ, [220].
• Diurnal motion, [10], [15].
• Doppler principle, [89].
• Double nebulæ, [215].
• Double stars, [198].
  • development of, [244].
• Driving clock, [80].
• Earth, atmosphere, [48].
• • mass, [45].
  • size and shape, [44].
  • warming of the earth, [47].
• Eclipses, nature of, [63].
  • annular eclipse, [64].
  • eclipse limits, [68].
  • eclipse maps, [70], [71].
  • number of, in a year, [69].
  • partial eclipse, [64].
  • prediction of, [70], [71].
  • recurrence of, [72].
  • shadow cone, [64], [66].
  • total eclipse, [64].
  • uses of, [73].
• Eclipses of Jupiter's satellites, [141].
• Eclipse theory of variable stars, [205].
• Ecliptic, [26].
  • obliquity of, [25].
• Ellipse, [33].
• Epochs for planetary motion, [30].
• Energy, radiant, [75].
  • condensation of, [76].
• Epicycle, [32].
• Equation of time, [53].
• Equator, [16], [21].
• Equatorial mounting, [80].
• Equinoxes, [25].
• Ether, [75].
• Evening star, [31].
• Faculæ, [122].
• Falling bodies, law of, [35].
• Finding the stars, [14].
• Fraunhofer lines, [87].
• Galaxy, [219].
• Geography of the sky, [16].
• Graphical representation, [6].
• Grating, diffraction, [84].
• Gravitation, law of, [37].
• Harvest moon, [93].
• Heat of the sun, [118], [126].
• Helmholtz, contraction theory of the sun, [126], [228].
• Horizon, [4], [21].
• Hour angle, [21].
• Hour circle, [21].
• Hyperbola, [38].
• Japetus, satellite of Saturn, [145].
• Jupiter, [136].
• • atmosphere, [139].
  • belts, [137].
  • invisible from fixed stars, [197].
  • orbit of, [29].
  • physical condition, [139].
  • rotation and flattening, [138].
  • satellites, [140].
  • surface markings, [137].
• Kepler's laws, [33], [111].
• Latitude, determination of, [18].
• Leap year, [61].
• Lenses, [77].
• Leonid meteor shower, [172].
• • perturbations of, [174].
• Librations of moon, [98].
• Life upon the planets, [157].
• Light curves, [205].
• Light, nature of, [75].
• Light year, [190].
• Limits of eclipses, [68].
• Longitude, [56].
  • determination of, [58].
• Lunation, [60].
• Magnifying power of telescope, [79].
• Magnitude, stellar, [9], [186].
• Mars, atmosphere, temperature, [150].
• • canals, [154].
  • orbit, [30].
  • polar caps, [152].
  • rotation, [151].
  • satellites, [155].
  • surface markings, [150].
• Mass, determination of, [37].
  • of comets, [164].
  • of double stars, [200].
  • of moon, [94].
  • of planets, [40], [133].
• Measurements, accurate, [1].
• Mercury, [149].
  • motion of its perihelion, [43].
  • orbit of, [30].
• Meridian, [19], [21].
• Meteors, nature of, [165], [169].
  • number of, [167].
  • velocity, [170].
• Meteors and comets, relation of, [175].
• Meteor showers, radiant, [171].
  • Leonids, capture of, [172], [173].
  • perturbations, [174].
• Milky Way, [219].
• Mira, ο Ceti, [204].
• Mirrors, [77].
• Month, [60].
• Moon, [91].
  • albedo, [97].
  • atmosphere, [103].
  • changes in, [108].
  • density, surface gravity, [95].
  • development of, [241].
  • harvest moon, [93].
  • influence upon the earth, [109], [233].
  • librations, [98].
  • map of, [101].
  • mass and size, [94].
  • motion, [24], [92].
  • mountains and craters, [104].
  • phases, [91], [92].
  • physical condition, [100], [107].
• Month, [60].
• Morning star, [31].
• Motion in line of sight, [89], [193].
• Multiple stars, [202].
• Names of stars, [8].
• Nebulæ, [214].
• • density, [217].
  • development of, [245].
  • motion, [218].
  • spectra, [216].
  • types and classes of, [215].
• Nebular hypothesis, [230].
  • objections to, [231].
• Neptune, [146].
  • discovery of, [41].
• Newton's laws of motion, [34].
  • law of gravitation, [37], [43].
• Nodes, [39].
  • relation to eclipses, [67], [71].
• Nucleus, of comet, [160].
• Objective, of telescope, [78].
• Obliquity of ecliptic, [25].
• Observations, of stars, [10].
• Occultation of stars, [103].
• Orbits, of comets, [161].
• • of double stars, [199].
  • of moon, [92].
  • of planets, [28].
• Orion nebula, [215].
• Parabola, [35], [38], [161].
• Parabolic velocity, [38].
• Parallax, [114], [188].
• Penumbra, [64], [121].
• Perihelion, [38].
• Periodic comets, [176].
• Personal equation, [82].
• Perturbations, [39].
• • of meteors, [174].
• Phases, of the moon, [91], [92].
• Photography, [81].
  • of stars, [13].
• Photosphere, of sun, [121].
• Planets, [26], [133].
  • distances from the sun, [134].
  • how to find, [29].
  • mass, density, size, [133].
  • motion of, [27], [38].
  • periodic times of, [30].
• Planetary nebulæ, [215].
• Pleiades, [16], [215].
• Plumb-line apparatus, [11], [18].
• Poles, [21].
• Precession, [46].
• Prisms, [84].
• Problem of three bodies, [39].
• Prominences, solar, [125].
• Proper motions, [191].
• Protractor, [2].
• Ptolemaic system, [32].
• Radiant energy, [75].
• Radiant, of meteor shower, [171].
• Radius victor, [33].
• Reference lines and circles, [17].
• Refraction, [50].
• Right ascension, [16], [20], [21].
• Roche's limit, [239].
• Rotation, of earth, [55].
• • of Mars, [151].
  • of moon, [99].
  • of Jupiter, [138].
  • of Saturn, [144].
  • of sun, [120], [132].
• Saros, [72].
• Satellites, of Jupiter, [136], [140].
• • of Mars, [155].
  • of Saturn, [145].
• Saturn, [142].
  • ball of, [144].
  • orbit, [29].
  • rings, [142].
  • rotation, [144].
  • satellites, [145].
• Seasons, on the earth, [47].
  • on Mars, [151].
• Shadow cone, [64], [66].
• Sidereal time, [20], [54].
• Shooting stars, [158]. (See [Meteor].)
• Spectroscope, [84].
• Spectroscopic binaries, [203].
• Spectrum, [84], [87].
  • of comets, [182].
  • of nebulæ, [216].
  • of stars, [211].
  • types of, [88].
• Spectrum analysis, [85].
• Spiral nebulæ, [215].
• Standard time, [57].
• Stars, [8], [184].
  • classes of, [212].
  • clusters, [213].
  • colors, [209].
  • dark stars, [201].
  • development of, [242].
  • distances from the sun, [188], [196].
  • distribution of, [220].
  • double stars, [198], [203].
  • drift, [194].
  • magnitudes, [9], [196].
  • number of, [185].
  • spectra, [211].
  • temporary, [208].
  • variable, [204].
• Starlight, absorption of, [225].
• Star maps, construction of, [23].
• Stellar system, extent of, [223].
• Sun's apparent motion, [25].
  • real motion, [195].
• Sun, [110].
  • chemical composition, [116].
  • chromosphere, [124].
  • corona, [123].
  • distance from the earth, [111].
  • faculæ, [119], [122].
  • gaseous constitution, [127].
  • heat of, [117].
  • mechanism of, [126].
  • physical properties, [115]-[120].
  • prominences, [125].
  • rotation, [120], [132].
  • surface of, [119].
  • temperature, [118].
• Sun spots, [119], [121].
  • period, [129], [131].
  • zones, [130].
• Telescopes, [78].
• • equatorial mounting for, [80].
  • magnifying power of, [79].
• Temperature of Jupiter, [139].
  • of Mars, [152].
  • of Mercury, [149].
  • of moon, [107].
  • of sun, [118].
• Temporary stars, [208].
• Terminator, [91].
• Tenth meter, [75].
• Tidal friction, [233]-[238].
• Tides, [42].
• Time, sidereal, [20], [54].
  • solar, [52].
  • determination of, [20].
  • equation of, [53].
  • standard, [57].
• Triangulation, [3].
• Trifid nebula, [215].
• Twilight, [51].
• Twinkling, of stars, [48].
• Universe, development of, [226].
• • stability of, [247].
• Uranus, [146].
• Variable stars, [204].
• Velocity, its relation to orbital motion, [38].
• Venus, [148].
• • orbit of, [30].
• Vernal equinox, [21], [25].
• Vertical circle, [21].
• Wave front, [76].
• Wave lengths, [75], [86].
• Year, [25].
• • leap year, [61].
  • sidereal year, [59].
  • tropical year, [60].
• Zenith, [21].
• Zodiac, [26].
• Zodiacal light, [168].

THE END