You are correct that the adjustments are minute. But you're also ignoring the fact that unlike a bullet, there isn't any atmosphere or unpredictible factors in

You are correct that the adjustments are minute. But you're also ignoring the fact that unlike a bullet, there isn't any atmosphere or unpredictible factors in your way. You can do the math and be sure about it. You can also use your math to course-correct after the fact. That's not at all like pointing your gun and pulling the trigger.