Günter D. Roth 
Handbook of Practical Astronomy [PDF ebook] 

Why Astronomy (G.D. Roth).- Fundamentals of Spherical Astronomy (M. Gottwald/F. Schmeidler).- Applied Mathematics and the Computer (M. Gottwald/F. Schmeidler).- Optics and Telescopes (B. Weisheit/H. Nicklas).- Mountings and Drives (B. Weisheit/H.G. Ziegler)).- Astrophotography (K.-P. Schröder/H. Lüthen).- Fundamentals of Spectral Analysis (G. Rupprecht/R.Häfner).- Principles of Photometry (H.W. Duerbeck).- Fundamentals of Radio Astronomy (M.J. Neumann/P. Wright).- Modern Sundials (F. Schmeidler).- Historical Exploration of Modern Astronomy (G.D. Roth).- The Social Astronomer (V. Witt).- The Sun (K. Reinsch/M. Delfs/E. Junker/P. Völker).- The Moon (G.D. Roth).- Eclipses and Transits (C. Treichel).- Occultations of Stars (C. Treichel).- Artificial Earth Satellites (C. Treichel).- Observation of the Planets (G.D. Roth).- Minor Planets (H. Böhnhardt).- Comets (H. Böhnhardt).- Meteors (F. Schmeidler).- Noctilucent Clouds, Polar Aurorae, and the Zodiacal Light (Ch. Leinert).- The Terrestrial Atmosphere and its Effects on Astronomicak Observations (F. Schmeidler).- The Stars (K.-P. Schröder).- Variable Stars (H.W. Duerbeck).- Binary Stars (H.W. Duerbeck).- The Milky Way and its Objects (K.-P. Schröder).- Extragalactic Objects (J. Feitzinger).