Η international υπηρεσία που παρακολουθεί την περιστροφή της Γης ανακοίνωσε ότι το 2015 προγραμματίζεται να διαρκέσει λίγο περισσότερο
The international service that monitors the rotation of the Earth announced that the 2015 is scheduled to last for an extra second - a change that threatens to interfere with Internet infrastructure, as happened the previous time.
Addition
According to the International Earth Rotation Service at the Paris Observatory, one inoculated second will be added to the standard international time at 11.59 pm on June 30. The addition will correct the discrepancy that has accumulated in recent years between astronomical time, which is calculated based on the rotation of the Earth, and the so-called "Synchronized World Time" (UTC), a standard based on measurements by atomic clocks throughout the world.
Atomic clocks measure time at a perfectly constant rate, while astronomical time shows small deviations. A variety of factors, such as the Earth's gravitational interaction with the Moon, fluctuate it speed περιστροφής του πλανήτη και επομένως και τη duration of 24 hours.
Theoretically, Earth's rotation speed may increase, so a negative second shot should be added to the international time. But this is rare. The usual is the addition of positive seconds, since over the last few decades the Earth's rotation period tends to decrease by about 2 milliseconds per day.
Abolition;
Bullet seconds have been added altogether 25 times since 1972 first applied the measure, five years after changing the definition of a second so that it is based on atomic time rather than astronomical.
Σήμερα, οι ΗΠΑ και άλλες χώρες ζητούν κατάργηση των εμβόλιμων δευτερολέπτων λόγω των προβλημάτων που δημιουργούν στην υποδομή του Διαδικτύου και τους δορυφόρους GPS. Η προσθήκη του τελευταίου εμβόλιμου δευτερολέπτου το 2012 γονάτισε δικτυακούς τόπους όπως το Reddit, το LinkedIn, το StumbleUpon και το Foursquare, ενώ προβλήματα εμφανίστηκαν και στο λειτουργικό system Linux and programs written in the Java language.
Google was ready for change thanks to a software upgrade called "Vacuum Pulse". In fact, the upgrade adds a lot of millisecond injections before the arrival of the official intake second so that the change is not abrupt. Due to the potential impact on computing systems, the US today wants to completely abolish the inoculum seconds.
Disagreements
Other countries disagree, as the abolition of the measure would mean that the international time measurement standard, UTC time, would be disconnected once and for all from the Earth's astronomical time. Among the countries that are reacting is Britain, as the abolition of the incipient seconds would virtually also abolish Greenwich Mean Time, the astronomical time measured in the first meridian of the Earth near London.
Greenwich Mean Time practically coincides with UTC, but it has a different definition and it is officially used less and less. As Roy McIvoy of the Royal Observatory of Greenwich said, the maintenance or elimination of the incipient seconds has been the subject of passionate discussions over 12 years. A final decision could be taken this year at the World Radiocommunication Conference to be held in Geneva in November.
