id author title date pages extension mime words sentences flesch summary cache txt en-wikipedia-org-3889 Coriolis force - Wikipedia .html text/html 12238 1534 67 The Earth completes one rotation for each day/night cycle, so for motions of everyday objects the Coriolis force is usually quite small compared with other forces; its effects generally become noticeable only for motions occurring over large distances and long periods of time, such as large-scale movement of air in the atmosphere or water in the ocean; or where high precision is important, such as long range artillery or missile trajectories. Though not obvious from this example, which considers northward motion, the horizontal deflection occurs equally for objects moving eastward or westward (or in any other direction).[8] However, the theory that the effect determines the rotation of draining water in a typical size household bathtub, sink or toilet has been repeatedly disproven by modern-day scientists; the force is negligibly small compared to the many other influences on the rotation.[9][10][11] ./cache/en-wikipedia-org-3889.html ./txt/en-wikipedia-org-3889.txt