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This book addresses graduate students in astronomy and§astrophysics. The first part is devoted to galactic§high-energy astrophysics. It treats particle accelerations§(including shocks), the interstellar medium and supernovae§remnants, high-energy emissions from normal stars and§accretion in close binaries. The second part deals with§observationslike pulsar timing, and its measurement with§radioastronomical tools, and astrometry, as performed in the§HIPPARCOS satellite program.