https://github.com/davepinch/pinchy.cc/blob/master/content/streams/the-brain/3/now-you-go-away-this-is-a-private-conversation.md
Due to the precession of Earth’s rotational axis, Thuban was the naked-eye star closest to the north pole from 3942 BC, when it superseded Tau Herculis as the pole star, until 1793 BC, when it was superseded by Kappa Draconis.