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.