I know about the Michaelson-Morley expt. trying to measure the speed of light, once in the direction of motion of the earth and then perpendicular to it. But the source of light was a torch (or similar) which is (obviously) on earth. I have somewhere read that it was also done with the source of light as sun. That is, it was experimented to find out whether the speed of light from sun appears the same while moving towards it or away from it. Can anyone tell me more about this experiment (with respect to sun) or provide a reference giving more details?