How is the Speed of Light Measured?

We wake up in the morning and see the lights all around us. If the light was not reaching then I would not be able to see anything. All was dark. Again, if it happened suddenly the sun stopped shining. It means that if someone switches off a light, it will take 8 minutes for the people of the world to understand it. When we turn off the light it turns off immediately but when the sun stops shining why does it take 8 minutes to turn off? It takes…

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