Submitted by Ice_Ice_Fetus t3_11drtwn in explainlikeimfive
eloquent_beaver t1_jaamb54 wrote
Reply to comment by WeDriftEternal in Eli5: When/How did the world realize that it wasn’t the same time everywhere? by Ice_Ice_Fetus
It's not literally "the same time everywhere."
In special relativity, simultaneity is relative and depends on your reference frame.
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