Half-hours with the Telescope: Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction |
Contents
CHAPTER | 1 |
CHAPTER II | 33 |
A HALFHOUR WITH LYRA HERCULES CORVUS CRATER ETC | 47 |
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61 Cygni 70 Ophiuchi Albireo Algol Almanac alt-azimuth Andromeda aperture appears Arcturus astronomical axis blue Bootis brilliant Capella Cassiopeia Castor centre cluster colours companion components constellation convex lens Cor Caroli Cygni Cygnus dark Dawes diameter directed disc distance distinct vision double star easy double ecliptic equator exhibit eye-glass eye-piece eye-tube favourable field of view finder focal length focus formed glass HALF-HOUR heavens Herculis Herschel horizon hour Howlett Hydræ instrument Jupiter Jupiter's light look low power Lyra Lyræ magnitude maps Mars Mercury meridian method Milky Mizar moderate power moon motion naked eye nearly nebula noticed object object-glass Ophiuchi Orion pass Pegasi planet Pole-star Pollux powerful telescope quadrature region right ascension rings satellites Saturn Scorpionis screen seen Serpentis shadow shown in Plate Sirius solar spherical aberration spot sun's tele trapezium tube turn variable Vega visible wide double yellow zenith пр