Oh no... That's not good (at least for me). Is there a technical reason for that?When caching is off, you are sending commands directly to the mount and not interpreted by APCC.
Does that mean that Horizons does not use the modelling either?Horizons uses APCC modeling in APCC Pro. I previously said Horizons turns off caching, but that was incorrect. I was thinking of APPM.
The move rates sent by Horizons are real-time calculated from the NASA data and sent to the mount in real-time. So although RA/Dec read backs are the cached values, the open-loop move commands happen in real-time. And, the only time you will likely see a delay in RA/Dec is with a fast-moving object, but that will also happen in any polled system (e.g, a planetarium program).