Brother, with all due respect nobody and I mean nobody lines up artillery like that close by
Except the Russians, indian army will never place all its guns by which I mean all 18 guns in a regiment in one place and lose them all in a bloody counter battery fire
We are not fools , although it's easy to calculate the trigonometry when you alingn all guns in one place as data for one gun is used for all guns , if you place guns at different places , it will confuse the enemy who won't be able to effectively retaliate in a counter battery fire.