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Although I do enjoy counting down the last ten seconds before rocket launch, I am still puzzled: Why do we still use countdown? What is real purpose behind the countdowm?

Why do we need to launch rocket exactly at (example) 10:15:00 ?

Is it just a thing we are used to do, because "thats how we do it from beginning" or is there any practical purpose of countdowns to exact time of launch?

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    $\begingroup$ It would be nice if people flagging a question as a duplicate give a reference to the duplicates for us wandering folks who just stumbled upon an interesting question... $\endgroup$ – Neowizard Jul 24 '14 at 14:57

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