Network Time Protocol
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The Network Time Protocol is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one o
NTP was designed by David L. Mills.
The U.S. Naval Observatory Alternate Master Clock at Schriever AFB (Colorado) is a stratum 0 source for NTP.
WWV (radio station)
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WWV is a shortwave radio station, located near Fort Collins, Colorado. It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitt
WWV Transmitter Building (2002 or earlier)
Alongside weekly broadcasts over WWV, in May 1920 the Bureau of Standards presented the "portaphone", with which one could "receive wireless impulses in the form of signals, music or speech, reproducing the same through a loud-speaking telephone and horn".
WWV seconds pulse generator, 1943
A 1940 QSL card for WWV