# Coriolis effect

## Explanation

Coriolis effect is an effect observed in a body that moves in a rotational system. Consider a powerful cannon at the north pole of the Earth and a big target at the equator. When someone fires the cannon towards the target, the cannonball curves to the right of the observer who fires it. This phenomenon observed is known as the Coriolis effect. As the Earth rotates from west to east, the speed of an object at different latitudes increases from the poles. Starting with zero at the poles and to a maximum of 1670 km/h at the equator. So when the cannonball is fired, it has the tangential speed of zero or the minimum, and due to inertia, it travels at the same speed as it reaches the equator. But, the target at the equator has a different and a faster tangential speed. So as the cannonball travels at a minimal tangential speed, it lags behind the target, which has a faster tangential speed. Therefore, the cannonball moves towards the right.

Coriolis effect is the reason why hurricanes spin anti-clockwise in the northern hemisphere and clockwise in the southern hemisphere. As the wind flows from both the poles to the equator, they deflect towards right and left from the northern and southern poles respectively. And due to the low-pressure area in the eye of a hurricane, the high-pressure air rushes down towards the eye along with Coriolis force and swirls in the anti-clockwise direction in the northern hemisphere and clockwise in the southern hemisphere.