One often unappreciated and amazing thing about the GPS-on-cellphones era is that nowadays everyone has the exact time. Up to the late 20th century it wasn't tr

One often unappreciated and amazing thing about the GPS-on-cellphones era is that nowadays everyone has the exact time. Up to the late 20th century it wasn't trivial to have the right time, in fact there was a three digit phone number you could call to get the right time (up to the minute).