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Illustration Angles Between the Spatial and Temporal Axes in a Minkowski Diagram

Angles Between the Spatial and Temporal Axes in a Minkowski Diagram
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Here you see a \(ct\)-\(x\) Minkowski diagram that represents an observer. Relative to this observer the \(ct_1\)-\(x\)-coordinate system of a moving observer is shown. The two time axis and the two spatial axis enclose an angle \(\alpha\). This angle depends on the relative velocity of the two observers.