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A spacetime diagram is a diagram that shows the effects of special relativity.

A '''spacetime diagram''' is a diagram that shows the effects of [[special relativity]].

Spacetime diagrams are often used to validate relativity (by demonstrating that the paradoxes of relativity are not actually paradoxes.) However, the whole concept of the spacetime diagram is constructed from relativity itself. Therefore, the logic is circular; spacetime diagrams do nothing to prove relativity.

Spacetime diagrams are often used to validate relativity (by demonstrating that the [[paradox]]es of relativity are not actually paradoxes.) However, the whole concept of the spacetime diagram is constructed from relativity itself. Therefore, the logic is circular; spacetime diagrams do nothing to prove relativity.

Suppose two reference frames, '''S''' and '''S' '''. Suppose '''S''' is stationary, and '''S' ''' is moving at velocity ''v''.

Suppose two reference frames, '''S''' and '''S' '''. Suppose '''S''' is stationary, and '''S' ''' is moving at velocity ''v''.