Precession of the equinoxes The main reason astrological signs fail to line up with the zodiac, though, is a wobble in the Earth’s rotational axis called precession.

This shift is called precession, and it is the foundation of the research team's work. Sign up for Chip Chick's newsletter and get stories like this delivered to your inbox.

An investigation, carried out by the astrophysicists of the Instituto de Astrofísica de Canarias (IAC), questions one of the ...