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DOOM! Pole shift leading to reversal is theoretically possible. Explained in detail since 18th age.
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[quote:EMPerror:MV8xOTM4MzMwXzMyNDg4MDk3XzkyQkZFMTNE] Earth axis is measured all the time and has a long history (in human lifetime scales at least). "The orientation of the Earth’s axis relative to space and its rotational velocity are currently established in a complicated process that involves 30 radio telescopes around the globe. Every Monday and Thursday, eight to twelve of these telescopes alternately measure the direction between Earth and specific quasars. Scientists assume that these galaxy nuclei never change their position and can therefore be used as reference points." Now there is another way to measure it. "A group with researchers at the Technical University of Munich (TUM) are the first to plot changes in the Earth’s axis through laboratory measurements. To do this, they constructed the world’s most stable ring laser in an underground lab and used it to determine changes in the Earth’s rotation. Previously, scientists were only able to track shifts in the polar axis indirectly by monitoring fixed objects in space." http://portal.mytum.de/pressestelle/pressemitteilungen/NewsArticle_20111220_100621 [/quote]
Original Message
Explanation for rotation around principal axis of intermediate inertia dates back to the 18th century when Leonhard Euler derrived equations for dynamics of rigid bodies.
[
link to en.wikipedia.org
]
[
link to einstein.stanford.edu
]
A body is never stable when spinning about the intermediate principal axis. It was easily seen in space (Skylab, links from the same page).
[
link to einstein.stanford.edu
]
[
link to einstein.stanford.edu
]
It was spotted, that bolts from untied cargo are flying in straight direction and suddenly flip, starting to spin in the opposite direction. This flipping was cyclic. V.A.Dzhanibekov was intrigued by this phenomenon and documented it. (no translation, but no need for words there)
[
link to www.youtube.com
]
[
link to www.youtube.com
]
It is pure mechanics, law of nature.
Magnetic poles are not stable and reverse their polarity. Is earth's spinning really stable? What are other factors that can make it stable? These questions need really careful consideration.
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