Redfish
Diamond Member
ok, but its not human activity, we agree, I think, on thatIt doesn't wobble ... I've been watching ... it moves 30 second-of-arc per year because of precession (≈ 1/60th of a Moon diameter) ... go look for yourself, it's a naked eye star ... why Columbus used it to find the Americas ...
The physical property here is called rotational inertia ... why bicycles work ... go look it up ... Earth's axis doesn't change with respect to the background stars except for the 43,000 year precession cycle ... [giggle] ... it's the Sun that moves that causes obliquity ...