|
When focusing on pocket watches, you can find plenty of amusing data. There are photons involved, which have waves oscillating in several ways. Thus, when a microwave photon has fluctuated exactly 9,192,631,770 times (by decree of the Thirteenth General Conference on Weights and Measures, 1967) an "atomic second" has elapsed. The Global Positioning System or GPS is a set of 24 satellites orbiting the Earth at an altitude of approximately 17.600 km and are determine the exact position anywhere on the planet. Each of the 24 satellites carries 4 atomic clocks on board. By triangulating signals from orbiting GPS receivers on Earth can find or obtain your location with great accuracy. Even the top pocket watches on board, have a margin of error of "one part in 10. This means that an observer will have to look at one of these watches for 10 seconds ¹ ² (32,000 years) to see it gain or lose a second. And in this case, accuracy is very important, as we shall see. Satellites and GPS Located in the sea, desert, city, or anywhere else, the user of a GPS receiver can know its exact location in latitude, longitude and altitude. A side effect to determine our position using the modern pocket watches GPS system is to determine precisely the time. For most users of GPS, what interests them is to know your position. The time-measuring devices are more accurate atomic clocks, based on the frequency of oscillation between two energy states of certain atoms or molecules. Models and precision The first models appeared in France. Due to their high precision, in 1967 they adopted the current definition of a second unit of time in the International System of Units, based on atomic clocks: a second is the time it takes for a cesium atom to vibrate 9,192,631,770 133 times in one state and specific conditions. In case you did not know, all this lead to unique pocket watches. Since ancient times, the man measured the number of hours of light that was the day, it invented the "sundial" which allowed him to measure the elapsed time between the rising and setting of the sun did not get the exact time as with an actual clock, but they could determine, for example, how long they remained light for hunting or whether they should rush to get from day to neighboring village. Discover all you need to know about pocket watches designs!
Related Articles -
pocket, watches,
|
