  The implications of the recent classical nonlocal generalization of
Einstein's theory of gravitation for gravitational physics in the Solar System
are investigated. In this theory, the nonlocal character of gravity appears to
simulate dark matter. Nonlocal gravity in the Newtonian regime involves a
reciprocal kernel with three spatial parameters, of which two have already been
determined from the rotation curves of spiral galaxies and the internal
dynamics of clusters of galaxies. However, the short-range parameter a_0
remains to be determined. In this connection, the nonlocal contribution to the
perihelion precession of a planetary orbit is estimated and a preliminary lower
limit on a_0 is determined.
