  Deep-space laser ranging will be ideal for testing relativistic gravity, and
mapping the solar-system to an unprecedented accuracy. ASTROD (Astrodynamical
Space Test of Relativity using Optical Devices) and ASTROD I are such missions.
ASTROD I is a mission with a single spacecraft; it is the first step of ASTROD
with 3 spacecraft. In this talk, after a brief review of ASTROD and ASTROD I,
we concentrate of the precision of solar astrodynamics that can be achieved
together with implications on astrometry and reference frame transformations.
The precision planetary ephemeris derived from these missions together with
second post-Newtonian test of relativistic gravity will serve as a foundation
for future precise astrometry observations. Relativistic frameworks are
discussed from these considerations.
