SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/astro-precession-cycle

About how long is Earth's axial precession cycle?

About 26,000 years.

Start playing free

  1. 260 years
  2. 26,000 years ✔
  3. 2.6 million years

Why: The direction of Earth's spin axis slowly traces a circle, much like a wobbling top. One full precession cycle takes roughly 26,000 years.

Huh, didn't know that: The Sun and Moon torque Earth's equatorial bulge and drive much of this slow wobble.

The dad joke
Precession is Earth's longest running wobble routine.
Like this card?
Play the game

References

Answer: 26,000 years. The direction of Earth's spin axis slowly traces a circle, much like a wobbling top. One full precession cycle takes roughly 26,000 years.

  1. Ancient Astronomy openstax.org/books/astronomy-2e/pages/2-2-ancient-astronomy
    It takes about 26,000 years for Earth’s axis to complete one circle of precession.
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Astronomy & SpaceWhy will Polaris not always be the North Star?Astronomy & SpaceWhich kind of light has the shortest wavelength, under 0.01 nanometer?Astronomy & SpaceRoughly what wavelength range is visible light?

That's stuff everyone should know.