When you set your watch with the watch that speaks or radio beeps, you ever wondered who is responsible for establishing that time and how they can be sure that it is accurate? This may seem a simple question, but there is no master clock to which the world can tune, however we have the next best thing called UTC (Coordinated Universal time). UTC is a global calendar based on the time shown by the clocks atomicos (International Atomic Time). Speaking candidly Bryant Estate told us the story. Since the time kept by the clocks atomicos is so accurate (a second not win or lose in several hundreds of millions of years using current technology of the atomic clock) is much more accurate than the existing time scales such as GMT (Greenwich Mean Time). The problem is that the Earth is not exact in his rotation, delaying occasionally due to the effects of gravity of the moon. To compensate for this UTC adds additional seconds to keep it in line with the GMT (and keep the Sun over the meridian line to the) noon and avoid night gradual drift in day). UTC is governed by a constellation of atomicos watches, which ensures greater accuracy as it is an average taken of all time (although differs in nano-segundos (billionth of a second) and also this method prevents that any country that has a political control of UTC.) The fundamental measure of time is the second. Before atomic clocks a second was simply a division of the number of seconds in a period of 24 hours (86,400 seconds in a day).

However, since the development of clocks atomicos one second has been defined by the international system of units as the resonance of an atom of caesium – 133, used in atomic clocks and oscillates 9,192,631,770 every second. UTC has been vital to govern the way in which we work and negotiate in a global community allowing trade across time zones to occur with confidence and security using NTP (Network Time Protocol) Server NTP servers are devices that can receive a UTC time signal, either directly from an atomic clock using a national time and frequency transmission, although not all countries have one. Or, more conveniently a NTP server can receive the signal from a GPS (Global Positioning System) sync atomic clock in the satellite and convert it to UTC. An NTP server will then synchronize all computers and devices on a network to this source of UTC time. While NTP is not the only time synchronization protocol it is largely the most commonly used with most networks synchronized to using it.