The usual distance is "near line-of-sight" meaning that if you see it clearly you can hit it, without the usual problem that "line of sight" extends to the horizon (true, but at that distance you don't really see your target anymore). If you want to cast spells into the remote, a combination with a spell that allows it will be needed.
Clairvoyance/clairsentience/clair-whatever, or would also require a combination of spells? That is, seeing/hearing/etc something happening in the present. Or psychometry or whatever, to view events related to an area or an object that have already happened.
Just getting some clarifications here. Perhaps those types of spells would not even be feasible in this universe, but it's good to know these things now.
