Earth Wobble Rings

Here is an interesting article about a proof of Earth's axis not being fixed. It wobbles by a tiny fraction of a degree. Ulrich Schreiber of Technical University of Munich and his team experimented the wobble in a lab with a ring laser. The article talks about how a ring laser works and how they measure the wobble using the beams. Schreiber and his team created the "Gross Ring" which is a cheap and better astronomical method of studying the Earth's rotation. Please read the article for more details and ask me if you have any questions or comments.