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Doom 3 Walkthrough - Delta Labs Sector 1 1. Listen to audio log, "Disciplinary Action Report" from Robert Price's PDA seen on the floor here.
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Watch the sun rise and set all over the world on this real-time, computer-generated illustration of the earth's patterns of sunlight and darkness. The clouds are updated every 3 hours with current weather satellite imagery. The Mercator projection used here is one way of looking at the spherical earth as a flat map. Used since the 16th century for navigation, straight lines on this map can be used accurately as compass bearings but the size and shape of continents are distorted.
Want to learn more about DSLR astrophotography? If you like the information you have read here, I have three books that you may find of interest. The first is aimed at beginners in astrophotography. The second is aimed at more advanced deep-sky imagers.