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POPSA Hemispherical Map of World Sunlight I found this while I was stumbling. It shows the dusk and dawn lines on earth. You can see it at: http://www.opentopia.com/sunlightmaphemi.html I also did a post at my blog: http://hotastronomy.com/2009/05/10/a-hemispherical-map-of-world-sunlight/