vendredi 29 septembre 2017

History of the measurement of the speed of light

Question in 1838 what would science have considered the speed of light?

I find in the wikipedia:

In 1729, James Bradley discovered stellar aberration.[87] From this effect he determined that light must travel 10,210 times faster than the Earth in its orbit (the modern figure is 10,066 times faster) or, equivalently, that it would take light 8 minutes 12 seconds to travel from the Sun to the Earth.

http://ift.tt/2xHv6TI

The next mention is that: In 1849, Fizeau calculated a value for the speed of light to a better precision than the previous value determined by Ole Rømer in 1676. He used a beam of light reflected from a mirror 8 kilometers away. The beam passed through the gaps between teeth of a rapidly rotating wheel. The speed of the wheel was increased until the returning light passed through the next gap and could be seen.

Fizeau calculated the speed of light to be 313,300 kilometres per second (194,700 mi/s), which was within 5% of the correct value (299,792.458 kilometers per second). Fizeau published the first results obtained by his method for determining the speed of light in 1849. (See Fizeau–Foucault apparatus.)[4] Fizeau made the first suggestion in 1864 that the "speed of a light wave be used as a length standard".

http://ift.tt/1KojB4s

So were there any other attempts between 1729 and 1849 to determine the speed of light?

Thanks for your assistance!


via International Skeptics Forum http://ift.tt/2xKYaLv

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