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19 December, 2011
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Wobbly Earth - Sixty Symbols
Axial precession is the reason the Earth's axis has a long-term but quite dramatic "wobble", as explained here by Roger Bowley and Mike Merrifield.
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Read time: 1 minSubmitted by Emanuela Clavarino on 22 December, 2011 - 10:00Sixty Symbols
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