Jaeger-LeCoultre watches classic spherical of five
 

Distinctive difference: the actual length of day and average day length, "What is time?" For this seemingly simple question, human genius Albert Einstein, another provides a wonderful answer. For him, because of the time are not absolute concepts, but only a relative concept, so big, but the instructions on the dial the number. The top smart academics have suggested, after the theory of relativity, in order to bring us a series of new experience and reflection, but it has never changed the time most people agree on. Nevertheless, even in the watch indicated time, also maintained a There can not be desired by the small differences. We know that we recognized the time to the Earth's revolution around the day as a basis. Theory, is equal to around a week day, then that one day humans split too, minute and second units. While speaking straightforward. But the whole logic, there is a small loophole. These words how I say this? Day the Earth around the running track for the elliptical-shaped curve, coupled with a slight tilt angle of the Earth, making each day a slight increase or decrease the actual length. Although the extent of change is limited,replica watches, but still really measured. Year, the longest and shortest days can vary 30 minutes and 45 seconds, the impact on daily life can be said to huge. For this reason, early human beings every day of the year Bianqiang as 86,400 seconds, such as length, or 1440 minutes, or 24 hours. The world all the time clocks Yiyi this established as a standard.