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The first real measurement of the speed of light came about half a century later, in 1676, by a Danish astronomer, Ole Römer, working at the Paris Observatory. He had made a systematic study of Io, one of the moons of Jupiter, which was eclipsed by Jupiter at regular intervals, as Io went around Jupiter in a circular orbit at a steady rate. Actually, Römer found, for several months the eclipses lagged more and more behind the expected time, but then they began to pick up again. In September 1676,he correctly predicted that an eclipse on November 9 would be 10 minutes behind schedule. This was indeed the case, to the surprise of his skeptical colleagues at the Royal Observatory in Paris. Two weeks later, he told them what was happening: as the Earth and Jupiter moved in their orbits, the distance between them varied. The light from Io (actually reflected sunlight, of course) took time to reach the earth, and took the longest time when the earth was furthest away. When the Earth was furthest from Jupiter, there was an extra distance for light to travel equal to the diameter of the Earth’s orbit compared with the point of closest approach. The observed eclipses were furthest behind the predicted times when the earth was furthest from Jupiter.
Originally posted by poet1b
reply to post by SplitInfinity
It is one thing to do something in the lab, but another to verify that in the real world.
Speed, velocity, and acceleration are all inter-related. If the velocity is constant, then the acceleration would have to be zero. Light moves at a frequency, the wave. Could the wave itself be a result of variation in acceleration
I have more on this, but have been busy.
Originally posted by poet1b
reply to post by SplitInfinity
Yeah, exactly!
What's you're concept? Come on, it can't be crazier than my curly hair concept of the electron.
I tend to think that finding out the way a Quanta can have more than one function is key to understanding this.