https://northcentralrotary.org/2021/07/08/generated-post

Many people are aware of the fact that the Earth revolves around the sun each day for 24 hours, but they don’t know that the planet’s rotational speed varies slightly. It is possible for a day to appear longer or shorter than you think. That is why the atomic clocks that maintain standardized time must be periodically adjusted, adding or subtracting a second. This is known as the leap second. This article will describe how this change takes place, and how it’s important to our daily routines.

One standard rotating event is precession. It is the circular wobble of Earth’s axis of motion, similar to as a spinny, slightly off-center toy top. The change in axial direction relative to fixed stars (inertial spaces) is a period of 25,771.5. This is also responsible for the direction of cyclones both in the Northern Hemisphere and the Southern Hemisphere. Other rotating events include the Chandler wobble, free nutation and Polar motion.

In addition to these periodic events, the speed of the rotator can be affected by weather conditions and other elements, including earthquakes. If the core of the Earth rotates faster, then the day appears to be shorter. This is due to tidal force that acts on the Earth’s surfaces and gravitational pulls on other major objects in the Solar System such as Jupiter and Saturn. This is the reason why Earth’s speed of rotation must be accounted for when designing fun park rides, like Ferris wheel and carousels.