Precession of the Equinoxes

Precession of the Equinoxes is a term that was commonly used to describe the gradual change in the orientation of the rotational axis of the Earth. This involves a slow process that takes about 26,000 years to complete. The 2nd century BC astronomer Hipparchus is generally thought to have discovered precession(a).

The African Humid Period (11,000-5,000 years ago) is attributed to the effects of precession. It gave us a ‘Green Sahara’ now associated by some modern researchers, including Sarantitis, Howard and Kelley, with the time and location of Atlantis.

(a) https://en.wikipedia.org/wiki/Axial_precession

(b) https://www.nature.com/scitable/knowledge/library/green-sahara-african-humid-periods-paced-by-82884405/