Bullets do not fly straight. Gravity affects them and pulls them down.
So if you are far enough away the gravity is going to have a significant effect, you cannot aim directly at what you want to hit. You have to aim high, and how high you have to aim depends on how far away the target is.
To zero in and fix for elevation means to calculate how much gravity is going to impact your bullet and it’s flight and adjust the site so it is high enough that the target will get hit.
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