system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do snipers have to take the Coriolis effect into account even though the shooter and the target spin together with the ground?

What I mean is : if you shoot a projectile that travels 500 mp/h from a truck that goes 50 mp/h in the same direction, the bullet goes 550 mp/h relatively to the ground but 500 mp/h relatively to the truck because the truck's momentum transfers to the shooter and the rifle.
Same goes for jumping on a plane : it doesn't escape from under your feet.
So since both the shooter and the target spin, why do you have to take Coriolis effect into account?
gpt
If the bullet is traveling north (EDIT: in the northern hemisphere) then the target is moving east slightly slower than the shooter (in the extreme, a target at the North Pole has no eastward speed, it's just rotating in one place). The bullet maintains the eastward speed that it had when fired, so as it approaches the target it appears to curve to the east because the target is moving slower.