Earth may be a non-inertial coordinate system.

Explanation: By now, we are conscious of the very fact that a coordinate system frame of reference may be a reference frame where an object is either moving with a continuing velocity or at rest. In such a frame, there's no net force working on an object as a result the thing isn't accelerated. However, during a non-inertial coordinate system, the motion of an object is acted upon by fictitious forces and other forces thanks to external action.

Earth rotating about its own axis causes an external force that leads to the acceleration of the motion of objects. This means that the world isn't an inertial coordinate system.