Research fields: Celestial mechanics, orbital and rotational dynamics of artificial satellites, non-gravitational perturbing forces (atmosphere, radiative effects). Theory of satellite motion in the atmosphere, models of the atmosphere, of the terrestrial albedo distribution. Theory of space accelerometric measurements. 1954 graduated in Astronomy from Charles University, Prague. 1959 PhD in Astronomy. 1984 DSc in Astronomy. Since 1954 at the Astronomical Institute, 1990-1996 Director of the Astronomical Institute. 1965-1971 with the Smithsonian Astrophysical Observatory, Cambridge, Mass., USA, 1988, 1989 with the DGFI Munich, Germany. About 118 research papers published.