Emergency Navigation

What Hacker News says

1. pgeAug 2018
   if you are interested in learning more, John Huth (who features prominently in the article) wrote a book: The Lost Art of Finding Our Way.

   I would also recommend "Emergency Navigation" by David Burch. Not about traditional navigation per se, but rather how to navigate at sea without instruments (which touches on some traditional celestial navigation methods)

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2. LucMar 2013
   In the book 'Emergency Navigation' by David Burch ( http://www.amazon.com/Emergency-Navigation-Improvised-No-Ins... ), the method is explained more clearly. With a clear Iceland spar crystal 1 to 2 inches on a side, the direction of the sun can be pinpointed to within a few degrees. You can also get the same effect using a piece of cellophane and the lens of a pair op polarized sunglasses. You do need a patch of clear sky at a 90 degrees angle from the sun direction to observe the change in intensity.
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