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earth rotation

   Also found in: Wikipedia 0.01 sec.
earth rotation [¦ərth rō¦tā·shən]
(astronomy)
Motion about the earth's axis that occurs 365.2422 times over a year's period.


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For the 23rd time since 1972, the International Earth Rotation and Reference System Service added an extra second to the time standard, a worldwide network of some 200 atomic clocks.
To leap or not to leap: scientists debate a timely issue by Cowen, Ron / Science News
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