vol.080：Bradley's Failed Experiment
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vol.080：Bradley's Failed Experiment
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In 1728, British astronomer James Bradley accidentally discovered stellar aberration while searching for evidence of stellar parallax. This phenomenon occurs when the Earth's orbital motion causes the apparent positions of stars to shift, much like how rain appears to fall at an angle to a moving traveler. By analyzing this shift, Bradley calculated the speed of light with remarkable precision, achieving a value within roughly 0.7% of modern measurements. His findings challenged the prevailing ether theory of the time by suggesting light possesses an absolute quality independent of a cosmic medium. Ultimately, Bradley’s observations served as a vital experimental foundation for Einstein’s special relativity, specifically supporting the principle that the velocity of light is constant. Today, his work remains a cornerstone of both astronomical correction and fundamental physics.