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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?


marked as duplicate by Hobbes, Rory Alsop, James Jenkins, Robert Cartaino Jul 21 '14 at 14:09

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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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