Modern artillery doesn‘t fire hundreds of kilometres. The ‚Schwerer Gustav‘ is a massive artillery in rails built by the germans and has a range of 130km. It‘s the longest shooting artillery afaik.
For comparison the American m777 can shoot up to 70km, the pzh2000 up to 80km.
Rocket artillery can obviously shoot much further and there your answer would be: gps and it can adjust trajectory mid flight. Or you don‘t, just point it in the rough direction and delete an entire 1km by 1km grid.
And m777 is aimed with math and sticks. Seriously, sticks.
You put up a couple sticks with specific markings, make sure your cannon is level and then adjust based on where your first shot lands.
Something like the pzh2000 is guided entirely by computers. Just put in the coordinates and push the button.
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