The second post had all the information necessary.
I only can add a story why it is sometimes necessary to know about Coriolis acceleration. I am less sure that it is true than I am about Coriolis acceleration itself.

In early WWI, a German fleet lost a sea battle to a British fleet in the South sea. The reason was supposedly that the Germans as relatively newcomers on the oceans did not take the variability of Coriolis acceleration into account. They still had set their long range shooting correction to the position of the North Sea. (On a shooting distance of 20 km, the 'drift' to one side can be 40m, so my recollection. Now if you are shooting in the South Sea and correct to the wrong direction you are off by 80m. That can be the difference between winning or loosing a battle. That's why you always should pay attention in school even in remote areas of physics.

Wolfgang