EVERYDAY SCIENCE

Detailed explanation-1: -Such a motion is called precession and consists of a cyclic wobbling in the orientation of Earth’s axis of rotation with a period of 25, 772 years. Precession was the third-discovered motion of Earth, after the far more obvious daily rotation and annual revolution.

Detailed explanation-2: -A: Astronomers call the wobble of Earth’s axis precession. While most of us are familiar with our planet’s primary motions-rotation (spinning once a day) and revolution (orbiting the Sun once a year)-few are aware of precession.

Detailed explanation-3: -The Wobble of Earth’s Axis The third orbital change that Milankovich studied is called precession, the cyclical wobble of Earth’s axis in a circle. The motion is like a spinning top when it is about to fall over.

Detailed explanation-4: -Nutation (from Latin nūtātiō ‘nodding, swaying’) is a rocking, swaying, or nodding motion in the axis of rotation of a largely axially symmetric object, such as a gyroscope, planet, or bullet in flight, or as an intended behaviour of a mechanism.

Detailed explanation-5: -Nutation occurs: when the sacrum absorbs shock; it moves down, forward, and rotates to the opposite side. as the sacrum moves anteriorly and inferiorly, the coccyx moves posteriorly relative to the ilium.