Peregrine wrote: Artillery, like any non-vehicle model, can shoot in any direction.
Or rather, the general assumption is that the rules are
supposed to allow non-vehicle models to shoot in any direction.
The shooting rules lack the allowance from last edition to turn models to face their targets in the shooting phase, and since the
LOS rules don't assign a fire arc to non-vehicles, or explain how to draw
LOS from anything that doesn't have a head, it's actually a great stonking hole in the current rules.
Most players either assume a 360 degree arc of fire, or turn non-vehicle models to face their targets, on the assumption that one of those options is most likely what was intended...