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This video has the info about how did Vikings travel long distance in the medieval age
There is no definite proof but the sun stone in the legend is the main character of today
I didn't like the documentary that just looks at the superficial facts
So I took long time for research, making scripts, and then made video
I tried to hold myself from going too deep
I am afraid if some would not have understood it :(
For more info, you can look at:
[1] The sunstone and polarised skylight : ancient Viking navigational tools?
[2] Success of sky-polarimetric Viking navigation : revealing the chance Viking sailors could reach Greenland from Norway
[3] The sixteenth century Alderney crystal: a calcite as an efficient reference optical compass?