Time signal | Wikipedia audio article
Channel: wikipedia tts
Date: 14/12/2018

This is an audio version of the Wikipedia Article:
Time signal


00:01:21 1 Audible and visible time signals
00:02:08 1.1 Signal guns
00:04:04 1.2 Sirens, whistles, and other audible signals
00:04:58 1.3 Visual signals
00:05:58 2 Electrical time signals
00:08:12 3 Radio time sources
00:08:22 3.1 Dedicated time signal broadcasts
00:10:06 3.2 General broadcasters
00:14:24 3.3 Digital delay
00:14:48 4 See also



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SUMMARY
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A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. 
Church bells or voices announcing hours of prayer gave way to automatically operated chimes on public clocks; however, audible signals (even signal guns) have limited range. Busy seaports used a visual signal, the dropping of a ball, to allow mariners to check the chronometers used for navigation. The advent of electrical telegraphs allowed widespread and precise distribution of time signals from central observatories. Railways were among the first customers for time signals, which allowed synchronization of their operations over wide geographic areas. Dedicated radio time signal stations transmit a signal that allows automatic synchronization of clocks, and commercial broadcasters still include time signals in their programming. 
Today, GPS navigation radio signals are used to precisely distribute time signals over much of the world. There are many commercially available radio controlled clocks available to accurately indicate the local time, both for business and residential use. Computers often set their time from an Internet atomic clock source. Where this is not available, a locally connected GPS receiver can precisely set the time using one of several software applications.