Let events 1 and 2 occur at and in frame S. In frame S' they occur at(adsbygoogle = window.adsbygoogle || []).push({});

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if this is true than time dialation rule IS no more applicable cause as we know to calculate the location of an event or anything at a certain location in a frame of reference " S' " using the coordinates of the location of this same event in frame "S " we must use the contraction of length law which will give us the exact location of the event in the frame of S' and samely to determien the time using time dialation rule , if an event 1 occur at t = 3 sec according to the clock of frame S this same event will occur at time X s which is calculated using the time dialation method , t= t0 / (radical (1- (v sqaure / c square ) .

and if the 2 events occured at the same time in the frame of reference S , throught the time dialation rule they must occure SIMULTANELY in frame S' but at diferent time of occurence in frame S .

I'e understood time dialation correclty but now I am confusing , why if we want to calculate the time that a spacecraft reaches a star we do apply the law of time dialation using the time of the arrival of this spacecraft in the frame of another observer , isnt the arrival is considered an event , so why other events are not being calculated using the same law .

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# Confusion between simultanety and time dialation

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