on June 30, 1981, the minute extending from 10:59 to 11:00 a.m. was arbitrarily lengthened to contain 61s.the last day of 1989 also lengthened by 1 s. such a leap second occasionally introduced to compensate for the fact that, as measured by our atomic time standard, the earth's rotation rate is slowly decreasing.why is it desirable to readjust our clocks in this way?
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rotation of the earth is a bit of and every 4 year it has an extra day but some one more sec is added
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