Hi GuavaGirl, The article claims that, “The sun never sets here.” Which, as in the example you provide, is untrue. My point is that the article should say something like, “The sun doesn’t set here for 63 days in the summer.” What I said about the 50% / 50% (1:1) relationship between solar exposure and darkness is true however. While, on earth, the daily relationship between dark and light varies based in latitude and season the aggregate light:dark ratio will always be 1:1. For every moment of light there will be a corresponding moment of dark. Your example of 63 sun “up” days in Deadhorse in the summer and 63 sun “down” days in the winter is a fine example of this. Of course I’m speaking in gross terms of perceptible light on an unobstructed horizontal plane. In the real world, fluctuations in the ratio will occur due to obstruction, grade, weather, etc.