When you set your clock with the clock that beeps or speech radio has ever wondered who is responsible for setting the time and how can they be sure that it is correct? This may seem a simple question, but there is no master clock to which the world can tune in, however we have the next best thing called UTC (Coordinated Universal Time). Movie Star: the source for more info. UTC is a global calendar based on the time indicated by the atomic clocks (International Atomic Time). Because the time kept by atomic clocks are so accurate (a second is not won or lost in several hundred million years using today’s technology atomic clock) is much more accurate than existing time scales such as GMT (Greenwich Mean Time). The problem is that the Earth is not accurate in their rotation, slowing from time to time due to the effects of lunar gravity. UTC To compensate for that added “extra seconds” in order to keep it in line with the GMT (and keep the Sun on the meridian line at noon and prevent gradual drift of the night into day).
UTC is governed by a constellation of atomic clocks, which ensures greater accuracy as an average taken of all time (although it differs in nano-seconds (billionths of a second) and also this method prevents any country that has political control of UTC. The key measure is the second time. Before atomic clocks one seconds was just one division of the number of seconds in a period of 24 hours (86,400 seconds in a day). However, from the development of atomic clocks one second has been defined by the International System of Units as the resonance of cesium -133 atom, used in atomic clocks, ranging 9,192,631,770 every second. UTC has been vital to govern the way we work and negotiate in a community allowing the global trade across time zones is made with confidence using the NTP server (Network Time Protocol) NTP servers are devices that can receive a signal from UTC time, either directly from an atomic clock using a national broadcast time and frequency, although not all countries have one. Or, more appropriately an NTP server can receive the synchronization signal of a GPS (Global Positioning System) satellites atomic clock and convert it to UTC. A NTP server then synchronizes all computers and devices on a network to this source of UTC. Although NTP is not the only time synchronization protocol as it is by far the most commonly used with most of synchronized networks using it.