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I have some very basic doubts on spacetime diagrams.

Please refer the figure attached.

Here in this spacetime figure an event E is shown as observed from K and K'.

K' moves with v with respect to K.

The axis CT is tilted angle alpha following vt, so that any event that occurs at x' = 0 in K' would occur at x = vt in K.

For frame K, to find space coordinate of the event, draw a perpendicular to x-axis.

But to find time coordinate draw a perpendicular to CT. why??

I dont get this and moreover the length of perpendicular gives x'??

Please explain

Abhishek Jain

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# Spacetime diagrams.

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