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In the years that followed, as better equipment and techniques were developed, many other people were able to measure the speed of light more accurately. With the resources of today's technology, we can measure it to an incredibly high precision. For instance, astronauts have attached a mirror to a rock on the moon; scientists on earth can aim a laser at this mirror and measure the travel time of the laser pulse--about two and a half seconds for the round trip. (The idea behind this experiment is not so different from Galileo's, if you think about it...) And anyone who measures the speed of light, at any time, using any method, always gets the same result: just slightly less than 300,000 kilometers per second.

http://www.Colorado.edu/physics/2000/waves_particles/lightspeed_evidence.html

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