John Carmichael writes: > We could make this question even more complimented if we consider the speed > of light. When we see the sun's center on the horizon we are seeing light > that left the sun about 8 minutes earlier. The sun really has already set. > (of course this has no practical effect on sundial time, but is fun to think > about!)
What does that mean, "The sun really has already set."? I would say, "By the time the light now leaving the sun gets here, I will have moved behind the edge of the Earth." But the sun really is located in the direction from which the light I see is coming. (There's a teeny tiny shift in the direction if I am moving perpendicular to the line of sight, but that is not the case at sunset.) Art Carlson
