The antennae of moths assist them in flying by acc
The antennae of moths assist them in flying by accounting for this effect, which is also used in mass flow meters.  The Rossby number can describe whether this effect is prominent in a system by relating it to inertial forces. When considered on the Earth, the Beta effect leads to its variation with latitude. This effect is caused by a pseudoforce and it was studied by a French scientist interested in water wheels. Leading to deflection of moving objects in rotating reference frames, it drives oceanic and atmospheric currents. For 10 points, name this effect which causes cyclones on Earth to rotate counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
The antennae of moths assist them in flying by accounting for this effect, which is also used in mass flow meters.  
Coriolis effect