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## Main Question or Discussion Point

Why is the unit vector for time in Minkowski space i.e. the fourth dimension unit vector always opposite in sign to the three other unit vectors?

The standard signature for Minkowski spacetime is either (-,+,+,+) or (+,-,-,-).

Is there some particular reason or advantage for making time opposite to the spatial dimensions?

The standard signature for Minkowski spacetime is either (-,+,+,+) or (+,-,-,-).

Is there some particular reason or advantage for making time opposite to the spatial dimensions?