Just yesterday I was looking for ephemerides, and found JPL's Horizon, which you can access with telnet: telnet horizons.jpl.nasa.gov 6775 You can type names,

Just yesterday I was looking for ephemerides, and found JPL's Horizon, which you can access with telnet: telnet horizons.jpl.nasa.gov 6775 You can type names, to get numbers (mercury is 1).