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Leap Second

 

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Activity Key

Uncorrected Text

You may no the meaning of "leap year," but has you herd of the leap second. In paris, a special groop of experts tracks the rotation of Earth from day to day. On December 31 each year, they may chose to add or subtract a second from clock time. It is necessary to add a leap second nearly onse a year on that day or june 30. All leap seconds since the first in 1972 have been aded to clock time. Subtractions are unlikely, but they are possible.

Answer Key

You may know the meaning of "leap year," but have you heard of the leap second? In Paris, a special group of experts tracks the rotation of Earth from day to day. On December 31 each year, they may choose to add or subtract a second from clock time. It is necessary to add a leap second nearly once a year on that day or June 30. All leap seconds since the first in 1972 have been added to clock time. Subtractions are unlikely, but they are possible.

 

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