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The title text refers to Einstein's {{w|Special relativity|special theory of relativity}} which postulates that the speed of light is the same for all observers, regardless of the motion of the light source (or the observers). An observer at high speed measures the same speed of light as an observer with no motion, measured from the same light source. In classical physics, the speed of the moving observer would be added up, but in special relativity, this isn't true. Instead, the time runs slower for the moving observer. Additionally to this {{w|time dilation}}, there is also a {{w|length contraction}}, without which the geometry wouldn't work. | The title text refers to Einstein's {{w|Special relativity|special theory of relativity}} which postulates that the speed of light is the same for all observers, regardless of the motion of the light source (or the observers). An observer at high speed measures the same speed of light as an observer with no motion, measured from the same light source. In classical physics, the speed of the moving observer would be added up, but in special relativity, this isn't true. Instead, the time runs slower for the moving observer. Additionally to this {{w|time dilation}}, there is also a {{w|length contraction}}, without which the geometry wouldn't work. | ||
β | "Today is one of the two days each year when my clocks run at the same speed as everyone else's" refers to the autumnal and vernal equinoxes when day and night are the same lengths, therefore causing his clocks to match the world | + | "Today is one of the two days each year when my clocks run at the same speed as everyone else's" refers to the autumnal and vernal equinoxes when day and night are the same lengths, therefore causing his clocks to match the world. |
==Transcript== | ==Transcript== |