June 29 was shortest day in recorded history - 'wobble' in Earth's spin shaved off 1.59 milliseconds | Businessinsider - Business Insider South Africa

The Earth is not a perfect sphere, so its axis can sometimes stray from the poles a little, bringing a tiny shift in the length of a day.

The Earth had its shortest ever day this summer, thanks to a wobble in its axis which meant it completed a single spin in a fraction of a second less than 24 hours. June 29 was 1.59 milliseconds sho… [+1720 chars]

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