Even though the light hitting this planet isn't the exact light the sun is emitting in real time; it's ability to luminescent what we see in real time isn't impacted even though the light source has an 8 minute delay. Think of light as being the tool that allows us to see, not what you are actually seeing.
This 8 minute delay would the sun's position in respect to it laminating earth. The time between night and day won't be in complete synchronization with the sun's position in real time, as light will go away and come back 8 minutes later than the sun's corresponding rotation around the earth. This doesn't effect what we see in real time, though, because regardless of how old the light is, if light is present... we are able to see in real time (not accounting for the fraction of a millisecond delay).
Last edited by FraGTaLiTy; 01-01-2010 at 10:25 PM.