"First published in 1910, coinciding with the first of two appearances by Halley's Comet during the book's life, Norton's owes much of its legendary success to its unique maps, arranged in slices known as gores, each covering approximately one-fifth of the sky. Every star visible to the naked eye under the clearest skies - down to magnitude 6.5 - is charted along with star clusters, nebulae and galaxies. Extensive tables of data on interesting objects...