  A precise ground based telescope system was developed for laser communication
experiments with the geostationary satellite ARTEMIS of ESA. Precise tracking
of the satellite was realized by using time resolved coordinates of the
satellite. During the experiments, the time propagation of laser signal from
the satellite and the point-ahead angle for the laser beam were calculated.
Some laser experiments though thin clouds were performed. A splitting of some
images of the laser beam from the satellite along declination and right
ascension coordinates of telescope could be observed through thin clouds. The
splitting along the declination coordinate may be interpreted as refraction in
the atmosphere. The splitting along the right ascension coordinate is
equivalent to the calculated point-ahead angle for the satellite. We find out
that a small part of laser beam was observed ahead of the velocity vector in
the point where the satellite would be after the laser light from the satellite
reaches the telescope. These results are in accordance with the theory of
relativity for aberration of light during transition from immovable to movable
coordinate systems. We directly observed laser light aberration as result of
moving of satellite with angular velocity close to Earth rotation.
