[HN Gopher] How is the speed of light measured? (1997)
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       How is the speed of light measured? (1997)
        
       Author : redbell
       Score  : 11 points
       Date   : 2023-07-11 20:22 UTC (1 days ago)
        
 (HTM) web link (web.archive.org)
 (TXT) w3m dump (web.archive.org)
        
       | redbell wrote:
       | > In 1728, James Bradley made another estimate by observing
       | stellar aberration.. Bradley measured this angle for starlight,
       | and knowing the speed of the Earth around the Sun, he found a
       | value for the speed of light of 301,000 km/s.
       | 
       | So technically, he almost got to the official number so far which
       | is 299,792.458 km/s. What an achievement!
        
       | baxtr wrote:
       | There is a cool video by Veritasium about the specifics of how
       | the speed of light is actually measured (1). I wasn't aware that
       | only the two way speed of light was measured so far, not the one
       | way. Which is probably very irrelevant but still quite
       | interesting.
       | 
       | (1) https://www.youtube.com/watch?v=pTn6Ewhb27k
        
       | berbec wrote:
       | The current page seems to show the same content
       | http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLigh...
        
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