Users who require an approximation in real time must obtain it from a time laboratory, which disseminates an approximation using techniques such as GPS or radio time signals.
12.
To correlate those positions with times, breaks in the lines were created by interrupting the exposures at times known by their relationship with radio time signals broadcast by the U . S . National Bureau of Standards.
13.
Many modern clocks are synchronized, either through the Internet or by radio time signals, to a worldwide time standard called Coordinated Universal Time ( UTC ) based on a network of master atomic clocks in many countries.
14.
This astronomic Greenwich meridian was disseminated around the world, first via the lunar distance method, then by chronometers carried on ships, then via telegraph lines carried by submarine communications cables, then via radio time signals.
15.
Radio time signal watches are a type of electronic quartz watch which synchronizes ( time transfers ) its time with an external leap-year status, and the state of daylight saving time ( on or off ).
16.
Many shortwave radio time signal services provide speaking clock services, such as John Doyle ) and WWVH ( voiced by Jane Barbe ), operated by the National Institute of Standards and Technology from the United States of America.
17.
Using long focus film cameras and the most accurate available radio time signals for the solar eclipse measurements, they were able to calculate the distance between Africa and South America to a higher accuracy than ever before : 141 m.
18.
The mapping involved surveyors drawing base maps at scales of six inches to the mile, using what was then the most up to date geographical techniques ( radio time signals and sextants to observe stars ) and geologists, including Carey, plotting the geology onto the maps from exposures in the banks of streams.
