Part I Foundations.- 1 Astrophysical Information.- 2 The Earth Atmosphere and Space.- 3 Radiation and Photometry.- 4 Space-Time Reference Frames.- Part II Data Collection.- 5 Telescopes and Images.- 6 Diffraction and Image Formation.- 7 Detectors.- 8 Spectral Analysis.- Part III Data Analysis.- 9 The Signal in Astronomy.- 10 Sky Surveys and Virtual Observatories.- A Fourier Transforms.- B Random Processes and Variables.- C Physical and Astronomical Constants.- D Tables of Space Missions.- E Webography.- F Acronyms.- Bibliography.- Index.