The Coriolis Effect

Long Range Shooting

It has been alleged that the Coriolis Effect plays a large part in accurate sharp shooting over long distances. However, several sniper veterans have stated that they have never taken the Coriolis Effect into account when shooting. We are pointed to the U.S. Marine Corps Sniping Manual, which does not mention the Coriolis Effect anywhere in the text at all.

U.S. Marine Corps Sniping Manual
Link https://archive.org/details/milmanual-fmfm-1-3b-sniping-u.s.-marine-corps/page/n0

The sniper must know the general principles of: perspective, vanishing point, perspective drawing, delineation, and geographical areas of intelligence operations. However, the words "Coriolis" or "Coriolis Effect," do not appear anywhere in the US Marine Corps Sniping Manual.

Wind Currents

The Wind Currents are put into gradual motion by the attraction of the Northern and Southern Celestial Systems, which are grinding against each other as gears at the equator line.

Water Currents

The rotation of small scale liquids in opposing hemispheres was debunked by Snopes.

As for water currents on a large scale; they're simply gradually put into motion by the winds. Water currents in the Northern Hemisphere will tend to rotate in one direction while currents in the Southern Hemisphere will tend to turn in another direction.