Originally Posted by LR3
, shooting north or south the earth will have rotated westward, hence the bullet will be to the right of target shooting north but left if shooting south.
FYI, bullet impact in the northern hemisphere is always to the right. Direction of fire does not matter. East and west do add a vertical component but there will always be a right hand impact.
To illustrate why it will have a right hand impact shooting north or south, see below.
Imagine shooting at a vehicle moving from right to left. If you fired while your crosshairs were right on target, your bullet would impact behind it or to the right.
You being the stationary component represent a shooter sitting on the North Pole shooting at a target on the equator. The target is moving therefore you miss.
Now envision that you're in the vehicle shooting at a target where you had been sitting. The vehicle is moving in the same direction as when you fired at it. You take aim and when your crosshairs line up with the target, you fire. Did you hit it? No. Why? Because your bullet is moving horizontally in relation to the target at the speed of the vehicle. When you fired, your bullet will impact to the right because the bullet was moving to the right when it was fired.
This represents you being on the equator shooting at a target on the North Pole.