Table of Contents

1 Presentation of Astrometry.- 2 Image Formation.- 3 Atmospheric Effects on Image Formation.- 4 Reduction of Observations.- 5 Small-Field Astrometry.- 6 Meridian Circles.- 7 Equal Altitude Instruments.- 8 Hipparcos.- 9 Very Small Field Astrometry.- 10 Phase Interferometry.- 11 Timing Techniques.- 12 Future of Astrometry.- References.