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To know all these... Fistly, we should know what is meant by the time. We should know how the time runs. it may be thw watch or wall cloxk which we are seeing... Do you know how was time invented?
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olden days railway, during the initial stage of railway track construction the time was measured based on the sun only. Measured as 12o'clock when the sun positioned exactly on top of our head.
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They called Einstein to clear this confusion. Then taking one standard time... Connecting the clocks in all other stations through the telegraphic signals.. And made a follow a standard time.
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This technique is called as the clock synchronization. This standard time is called the Greenwich standard time. We heard this word many times.
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To test this, an experiment was conducted in 1971 based on space and time theory proposed by Einstein. Atomic clock it means that would show the micro millisecond accuracy. taking two atomic clocks. placing on the earth and the other in the aeroplane... Circulated the earth for once sitting in that aeroplane. we will see in part 2 of this blog.