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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.
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.
==Definition==
*1. a. intr. To occur at the same [[time]]; to coincide in point of time; to be contemporary or simultaneous. Const. with.
::b. trans. To cause to be, or represent as, synchronous; to assign the same date to; to bring together events, etc. belonging to the same time. Also absol.
*2. a. intr. To occur at the same successive instants of time; to keep time with; to go on at the same rate and exactly together; to have coincident periods, as two sets of [[movements]] or [[vibration]]s.
::b. trans. To cause to go at the same rate; spec. to cause (a timepiece) to indicate the same time as another.
::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.
==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.
