Hi,
In the "Last Word" section of a recent _New Scientist_ Stephen
Parish raised the question of sundials that might work on cloudy
days...Clearly, polarisation is possible, but I'm doubtful about shadow
casting...
Clouding the issue
* 18 March 2015
* Magazine issue 3013 <http://www.newscientist.com/issue/3013>.
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*Are there any wavelengths at which the sun still casts a shadow when
the sky is full of clouds? Could I make a sundial that would work on a
cloudy day?*
/Stephen Parish, London, UK/
/This article appeared in print under the headline "Clouding the issue"/
Issue 3013 of New Scientist magazine
<http://www.newscientist.com/issue/3013>
* From issue 3013 <http://www.newscientist.com/issue/3013> of New
Scientist magazine, page 57.
best wishes,
Peter
--
Peter Mayer
Department of Politics & International Studies (POLIS)
School of Social Sciences
http://www.arts.adelaide.edu.au/polis/
The University of Adelaide, AUSTRALIA 5005
Ph : +61 8 8313 5609
Fax : +61 8 8313 3443
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