SUN IN A BEER CAN: Last July, Jan Koeman of Middelburg, the Netherlands, poked a tiny hole in an empty beer can, inserted a piece of photographic paper, and pointed the pinhole toward the sun. Six months later (Dec. 23, 2010) he extracted the paper and beheld the result. "This is called solargraphy," explains Koeman. "Every day the sun makes a track across the photographic paper--high in the summer and low in the winter. Daily tracks are interrupted by clouds and, occasionally, absent altogether because of rainy days." It's a low-tech but beautiful way to record the seasons; browse the links below for more examples.
http://www.spaceweather.com/archive.php?view=1&day=28&month=12&year=2010
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