Oddbean new post about login | logout It is TIME for you to learn a new thing. WWV is the callsign of a radio transmitter run by NIST that transmits an accurate time signal clocks with an appropriate receiver can use to keep themselves accurate. Most clocks with this feature are sold as "atomic clocks" because WWV and the other radio time signals like WWVB and WWVH use the atomic clocks as their source of time. https://en.m.wikipedia.org/wiki/WWV_(radio_station)