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The South Pole Just Moved. Here's Why [the ice sheet the marker is on is shifting]
(www.scientificamerican.com)
this post was submitted on 06 Jan 2026
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The south pole doesn't move. The ice sheet moves, so every year they move the marker to keep at the actual pole.
Well that's just a matter of your inertial reference frame.
The pole is defined in reference to the earth, so the frame is fixed. The pole moves in respect to the ice sheet, sure, but that's why they have to move the marker.
The earths axis of rotation does process over time too which I think might cause a very small portion of the movement too, I'm not 100% sure though 😅