[throw0101a]

See also:

* https://en.wikipedia.org/wiki/Axial_precession

Because of this precession ("wobble"), it turns out that the "North Star" has not always been Polaris. Back when the Pyramids were built in ancient Egypt north pointed to Thuban.

The Hoover Dam actually has a monument that gives the year it was built using this astronomical fact:

* https://blog.longnow.org/02019/01/29/the-26000-year-astronom...

* https://grahamhancock.com/motlochw1/

* https://www.quora.com/At-the-Hoover-Dam-what-is-the-meaning-...

* https://kottke.org/19/02/the-hoover-dams-hidden-26000-year-a... (via)