Just noting here that SPICE is the (C) library that underpins JPL Horizons, and the custom software of many NASA/ESA missions. It could be wrapped if we want to avoid internet access being a requirement for ephemerides. We'd have to verify the licensing requirements, but I _suspect_ that it can effectively be considered public domain (it's somewhat unclear if derivative software needs export clearance etc).
Just noting here that SPICE is the (C) library that underpins JPL Horizons, and the custom software of many NASA/ESA missions. It could be wrapped if we want to avoid internet access being a requirement for ephemerides. We'd have to verify the licensing requirements, but I _suspect_ that it can effectively be considered public domain (it's somewhat unclear if derivative software needs export clearance etc).