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...and you'll enjoy exploring Dave Bollinger's photostream further, a bold and wonder-full use of Flickr
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"...A typical use might be to determine when the sun will set along the axis of a mountain valley, or when a full moon rise will rise across a lake. The application uses Google Maps providing users the ability to select a location and determine the time and azimuth of sunrise or sunset for a given date or dates."
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PowerPoint presentation, bulleted and factiferous but authoritative
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a nice summary of Leonardo's "intellectual phases" via Bruce Sterling's Beyond The Beyond