NASA JPL Development Ephemerides (DE430)

DE430 spans from 1549-12-21 to 2650-01-25 and is based on the International Celestial Reference Frame (version 2.0).

The JPL planetary ephemerides are saved as files of Chebyshev polynomials fit to the Cartesian positions and velocities of the planets, the Sun, and the Moon, typically in 32-day intervals. The positions are integrated in astronomical units (au), but with polynomials stored in units of kilometers.

References:

Folkner, W. M., et al. (2014). The planetary and lunar ephemerides DE430 and DE431.

http://ssd.jpl.nasa.gov/?planet_eph_export