the effect is called Coriolis drift, and Coriolis effect. In fact, for long range factors, there are a whole loaded of effects need compensation. These factors are not only for bombers, but also for long range snipers to consider. There is a table for the sniper to find the adjustment required for additional compensation besides the need for aerodynamic factors. Check external ballistics in wiki to get more details. Btw, conner was wrong because these factors only affect long range, jumping up and down on the earth surface is to short for these factors to be meaningful.