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| | The Speed of Light - A Limit on Principle? |
 | | Relative, apparent, and vulgar time, is some sensible and external measure of duration by motion, whether accurate or unequable, which is commonly used instead of true time; as an hour, a day, a month, a year. |
 | | Because of this absolute time the global notion of past, present and future is the same in all reference frames. |
 | | However, it has to be emphasized that although the existence of a physical absolute time (or, equivalently, a preferred reference frame) could not be established by experiments, the theory of special relativity does not disprove it either. |
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