Patrick Moore 
Data Book of Astronomy [PDF ebook] 

Filled with data about the Earth, Moon, the planets, the stars, our Galaxy, and the myriad galaxies in deep space, this invaluable resource reveals the latest scientific discoveries about black holes, quasars, and the origins of the Universe. It includes maps supported by detailed tables of the names, positions, magnitudes, and spectra of the main stars in each constellation along with key data on galaxies, nebulae, and clusters. MNASSA wrote, "This book fills a niche , with detailed astronomical data and concise explanations, all at an accessible level , it is an excellent resource, and probably will be the first book I shall reach for.