3 ms·
https://en.wikipedia.org/wiki/Sunstone_(medieval)#Possibility_of_use_for_orientation_and_navigation https://en.wikipedia.org/wiki/Sunstone_(medieval)#Possibilit
by dekhn 2y ago
https://en.wikipedia.org/wiki/Sunstone_(medieval)#Possibility_of_use_for_orientation_and_navigation https://en.wikipedia.org/wiki/Sunstone_(medieval)#Possibilit...