1. Introduction 2. New observational techniques 3. Basic principles and coordinate systems 4. Treatment of astronomical data 5. Principles of relativity 6. Apparent displacements of celestial objects 7. Extragalactic reference frame 8. Dynamical reference frame 9. Terrestrial coordinate systems 10. Earth orientation 11. Stars 12. Double and multiple star systems 13. Astronomical phenomena 14. Application of theory to observations Appendices.
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