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Friday, January 16, 2015

Internet Doomsday 2015

Time will increased 1 Second on June 30, 2015
On Tuesday, June 30, 2015 will be one second longer than other days throughout the year. Scientists will add 1 second on that day or the so-called leap seconds.

According to scientists from the International Earth Rotation and Reference Systems Service (IERRSS), it is done to make sure the time on an atomic clock with the time fixed in accordance with the rotation of the earth - which slows down about 1 per 2,000 seconds per day.

The atomic clocks - are known to have high accuracy of 10^9 seconds per day and will not change until the thousand years were - used to set the time on Earth.

Although the rotation of Earth on its axis is slowing, atomic clocks keep moving constantly. Indeed, this is not a serious matter, but such conditions would make an atomic clock is not synchronized with the rotation of the Earth. At the extremes, the instrument might indicate broad daylight time when the sky is dark. Or at least in the year of 2700, one day on Earth to 24.5 hours - not 24 hours as it should.

"Geologically, the movement of the Earth slows down from time to time, and it can cause problems," said Demetrios Matsakis, Head of Time Services at the the US Naval Observatory as by LiveScience on Saturday, January 10, 2015. "What would you do if it turns out the day to be more long?"
This summer, a “leap second” will threaten to wreak havoc across the Internet. (Picture from: http://bit.ly/1BzwNze)
The solution, the International Earth Rotation Service (IERS) adds 1 second as an adjustment. The leap second is scheduled to be at the mid point of the year, June 30, 2015 at 23:59:59 UTC.

And it's not the first time that happened, but this will be the 26th leap second added to a calendar year since the practice began in 1972.

Internet Doomsday
Although no effect on human life in general, the addition of 1 second this time feared to re-ignite 'internet doomsday' in a small scale.

The similar addition in 2012 caused problems for large Internet companies such as Reddit, LinkedIn, Gizmodo, Gawker, Yelp, and Foursquare. As quoted from the Wired, Reddit had impaired for 1.5 hours.

Problems experienced by Amadeus Altea, one of the major online reservation system. The Qantas and Virgin Australia flight plan also had impaired.

Therefore, during the leap second, the computer clock will still move for 60 seconds. Matsakis said, computer considers by adding second as a step backwards. The computer system can not recognize the 'two seconds at the same time'. As a result, the machine will take it as an error, a heavy burden would be experienced by the CPU.

Differences with Google. The search engine giant has added a few milliseconds on the server several times a year. In this way, the server will not be affected when the addition of a second.

Another way to avoid problems is to turn off the computer system for 1 or 2 hours around the time of the addition.

However, it is not only a leap second is risky on a computer system. Matsakis hope, he never was in the plane when it was done. Therefore, the addition of second known to disrupt GPS reception, which can be a problem for pilots.

Leap second is more subtle correction than a leap year. There is an additional 1 day - in February 29 - every 4 years.

It is common knowledge, the Earth rotation is not perfect, and there are deviations from year to year at the level of milliseconds. So in every few years, the necessary adjustments, the addition seconds done in June or December. To be sure, in June 30, 2015 will have 86.401 seconds, not 86,400. *** [EKA | FROM VARIOUS SOURCES | LIVESCIENCE]
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