This Appendix explains in detail how to use the JPL HORIZONS system to create an ephemeris file for solar-system bodies. These can be used in either Science Goals (Section 5.3.2.1) or Scheduling Blocks (Section 6.2.4.1). Only ephemerides generated by HORIZONS will work with the ALMA Control System and the OT will reject the ephemeris if this is not the case.