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Today, synchronisation can occur on a global basis due to GPS-enabled timekeeping systems.
Today, synchronisation can occur on a global basis due to GPS-enabled timekeeping systems.
==Definition==
==Definition==
*1. a. intr. To occur at the same [[time]]; to coincide in point of time; to be contemporary or simultaneous. Const. with.
*1. a. intr. To occur at the same [[time]]; to coincide in point of time; to be contemporary or simultaneous. Const. with.
:c. In technical senses: to cause to coincide in time; to operate simultaneously or in synchronization. Also intr.
:c. In technical senses: to cause to coincide in time; to operate simultaneously or in synchronization. Also intr.
*3. gen. To combine or co-ordinate.
*3. gen. To combine or co-ordinate.
==Transport==
Apart from its use for [[navigation]] (see John Harrison), synchronization was not important in transportation until the nineteenth century, when the coming of the railways made travel fast enough for the [[difference]]s in local time between adjacent towns to be noticeable (see [1]).
In some territories, sharing of single railroad tracks was controlled by the timetable. Thus strict timekeeping was a safety requirement. To this day, railroads can [[communicate]] and signal along their tracks, independently of other systems for safety.
==Communication==
==Communication==
The lessons of timekeeping are part of [[engineering]] [[technology]]. In electrical engineering terms, for [[digital]] [[logic]] and data transfer, a synchronous object requires a clock signal. Timekeeping technologies such as the GPS satellites and Network time protocol (NTP) provide [[real-time]] access to a close approximation to the UTC timescale, and are used for many [[terrestrial]] synchronisation applications.
The lessons of timekeeping are part of [[engineering]] [[technology]]. In electrical engineering terms, for [[digital]] [[logic]] and data transfer, a synchronous object requires a clock signal. Timekeeping technologies such as the GPS satellites and Network time protocol (NTP) provide [[real-time]] access to a close approximation to the UTC timescale, and are used for many [[terrestrial]] synchronisation applications.
