Kepler's self-authored epitaph:
Mensus eram coelos, nunc terrae metior umbras
Mens coelestis erat, corporis umbra iacet.
I measured the skies, now the shadows I measure
Skybound was the mind, earthbound the body rests.
http://en.wikipedia.org/wiki/Snell%27s_law
http://herz-fischler.ca/ARTICLES/articles.html
http://www.lumen.nu/rekveld/wp/?page_id=340
http://thefloatinglibrary.com/2009/02/13/a-new-refutation-of-time-selections-j-l-borges/
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