How long is the precession cycle?
A)1 day
B)29.5 days
C)365.24 days
D)18 years, 11.3 days
E)26,000 years

Question

Quizplus · Accepted Answer

The precession cycle, also known as the precession of the equinoxes, is the slow wobbling of Earth's axis which traces out a circle over a period of approximately 26,000 years. Therefore, the correct choice is E, 26,000 years. The precession cycle refers to the slow movement of the Earth's rotational axis, and it takes approximately 26,000 years to complete one full cycle. Option A refers to the Earth's rotation period, option B refers to the synodic period of the moon, option C refers to the length of a tropical year, and option D refers to the period of the lunar nodal cycle.

How Long Is the Precession Cycle