Question

Is the rotation of the earth periodic answer in yes or no ?

Answer 1

No, the rotation of the earth is not periodic.

It changes some times but the changes are negligible.

Because of these changes the days seem longer and shorter some times.

The earth takes 23 hours 56 minutes and 4 seconds to complete one rotation but some times it changes and that's when we can say the rotation is not periodic.

Answer 2

Yes the rotation of the earth is periodic because it takes 24 hours for a full rotation(23 hours 56 minutes to be precise)

Sometimes the length of day and night does increase or decrese during vernal equinox and summer solistice caused when the Earth's equator passes through the center of the Sun(solstice) and when one of the pole of the Earth bends to its maximum towards (equinox) the Sun