why the second is not defined by the length of the day

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why the second is not defined by the length of the day

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Welcome to Openstudy! :) The length of the day is not a fixed unit of time. The earth itself is wobbling through space, traveling on a very slight elliptical path and the rotation is slowing down because of tidal action and the moon moving ever so slightly away. The length of the day not only changes throughout the year but about every 18 years or so, and extra leap second is added to the calendar. The second is defined using a number of rotations of the cesium 133 atom at 0 Kelvin because apart from quantum mechanics, it isn't subject to extraneous factors.
ty
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