Is anyone's watch/clock ever set the correct time to the second?

Question

Who keeps track of time and how do we make sure our sources are reliable?

Answer 1

Atomic clocks are accurate to the second. The atomic clocks that you can purchase are sent a signal via satellite from the real atomic clocks which are cesium oscillators (they keep time by measuring the rate of decay of cesium atoms which is the metric standard for 1 second.) There are also atomic clock servers on the web which you can use to set your watch to. In the United States, the standard of time is regulated by the US Naval Observatory's Master Clock (USNO), the official source of time for the Department of Defense.

Answer 2

Atomic clock receivers (which you can buy at most stores now for very little) are accurate because they are controlled by radio transmissions from signals that originate with cesium atomic clocks. The timing of these clocks is controlled by the vibrational rate of cesium atoms. Its accurace is one second of variation in one million years. The National Institute of Standards cesium fountain clock is located in Boulder, Colorado; it broadcasts continuous time and frequency signals on 60 kHz from a site in Fort Collins, Colorado.

Answer 3

there are some british and american government organisations, (and i'm sure plenty of other countries, too) as well as private instutions, who devote their lives to the study of time and time-telling devices. I believe the most accurate clock on the planet is at Greenwich and it's a nuclear clock.

Answer 4

Check out this link, and click, "About this service" to find out about their source.

Answer 5

Confucious say, "He who have two watches, never know what time it is."

Answer 6

http://en.wikipedia.org/wiki/International_Atomic_Time