January 21, 2012
Another birthday means another year in which the universe got to experience itself through your particular combination of wonder and will.
Days in the Sun
Birthday · January 21, 2012
A little universe, just for you
Your date.
Ready to give.
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APOD published January 21, 2012. Credit: Regina Valkenborgh. A publication-date match, not a photo taken on your date. Independent of NASA.
From solstice to solstice, this six month long exposure compresses time from the 21st of June till the 21st of December, 2011, into a single point of view. Dubbed a solargraph, the unconventional picture was recorded with a pinhole camera made from a drink can lined with a piece of photographic paper. Fixed to a single spot for the entire exposure, the simple camera continuously records the Sun's path each day as a glowing trail burned into the photosensitive paper. In this case, the spot was chosen to look out over the domes and radio telescope of the University of Hertfordshire's Bayfordbury Observatory. Dark gaps in the daily arcs are caused by cloud cover, whereas continuous bright tracks record glorious spells of sunny weather. Of course, in June, the Sun trails begin higher at the northern hemisphere's summer solstice. The trails sink lower in the sky as December's winter solstice approaches. Last year's autumn was one of the balmiest on record in the UK, as the many bright arcs in the lower part of this picture testify.
Image credit: Regina Valkenborgh