The Coriolis Force is what seems like a force to an object moving within a rotation frame of reference. As the object is curving according to the frame of reference, in that frame of reference, it seems to be forced to one side. It is a factor in rotation fluids, e.g., Atmospheres, stars, disks, clouds in galaxies, etc. The apparent force is to the left if the rotation is clockwise, and to the right if it is counterclockwise. The apparent deflection of the object is called the Coriolis Effect.
General Relativity (GR)
Rossby Number (Ro)