Well, we know that the speed of light is +- 299 792 458 meters per second and we also know that the distance between earth and sun +- is 149 597 870 691 meters.

So it's simple, just a rule of three, if light takes 1 second to travel 299 792 458 meters how much time will it take to travel 149 597 870 691 meters?

149 597 870 691/ 299 792 458= 499 seconds, about 8.32 seconds

So it's simple, just a rule of three, if light takes 1 second to travel 299 792 458 meters how much time will it take to travel 149 597 870 691 meters?

149 597 870 691/ 299 792 458= 499 seconds, about 8.32 seconds