In June 2015 will be longer than June in other years. One day on June 30, 2015 not only 24 hours, but 24 hours and 1 second. On that date, the day will end instead of at 23:59:59, but on 23.59.60. Dated July 1, 2015 itself remains will begin at 00:00:00.
As quoted from kompas.com, additional seconds it's called a leap second. The addition is done according to the decision of the International Earth Rotation and Reference Systems Service in Paris in 1972. The purpose of leap seconds is equal to a leap year, which adjusts the time with the actual movement of the Earth. However, because they are different.
In the case of leap years, why is the movement of the Earth around the Sun, which is not actually 365 days, but 365.25 days. If one year is left constantly 365 days, then the time will be not in accordance with the actual movement of the Earth. The beginning of the season, for example, will continue to retreat.
Meanwhile, decided one day is equal to 365.25 days is also not possible. If it is decided that way, there will be a day that ended at 06.00 am or even 12:00 noon. Option to synchronize time with the movement of the Earth then was added one day in the year is divisible by 4, but not divisible by 100 and 400.
Well, in the case of leap seconds, is more complex, namely because of the gravity of the Sun and the Moon which makes the rotation of the Earth more slowly. To imagine, try rotating the mature eggs (with the shell of course) and a raw egg. Observe rotation. The eggs were overcooked, because inside dense, will have a constant rotation speed and not swayed.
Conversely, raw eggs, because it has liquid egg whites, will sway and slow. Earth suffer like raw eggs. Why the Earth is not completely solid, and there are gravity of the Moon and the Sun that influences the rotational movement. A number of events on Earth, such as earthquakes, volcanic eruptions, and melting ice, affecting the speed of rotation of the Earth.
Based on the research results of National Aeronautics and Space Administration (NASA), the day on Earth over a length of 2.5 milliseconds since 1820. The difference is imperceptible fraction of a second. But remember, we are now living with the device that requires punctuality, such as GPS, smartphones, and satellites.
In order to keep the right time and in sync with the Earth's movement, leap seconds should be added. The addition could be in June or December. Period leap second is more complicated than a leap year, ie every interval of 7 years, 3 years, 3.5 years, and 3 years. Since 1972, there have been 26 leap seconds.
The human ability to adjust its own time could not be separated from the idea of an atomic clock. Thanks to atomic clocks, humans have a more precise definition of the second. One second, based on the idea that atomic clocks, is 9.192.631.770 oscillations of the cesium atom microwave signals.
The addition of a second is done so that the accuracy of the timing remains high. The addition is done at the time of Universal Coordinated Time (UTC).
Written By : Arbha ~ Public-DYK
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