Introduction to special relativity and Minkowski spacetime diagrams | Khan Academy
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Including multiple observers in the "most obvious" way led to some problems. Let's see how we can start to solve those problems by introducing (what we'll later call) Minkowski spacetime diagrams.
Watch the next lesson: https://www.khanacademy.org/science/physics/special-relativity/minkowski-spacetime-2016-01-18T22:56:14.718Z/v/measuring-time-in-meters-in-minkowski-spacetime?utm_source=YT&utm_medium=Desc&utm_campaign=physics
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