When a long-range cannonball is fired toward the equator from a northern (or southern) latitude, it lands west of its "intended" longitude. why?

Whenever a long range cannonball is shot at the equator from the northern latitude, it will land west of its intended target because of the coriolis effect. This simply means that when you are in the northern hemisphere, any large movements will result in turning to the right, if you are in the southern hemisphere, the opposite is true, things will turn to the left.