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10.1098/rsos.172187 http://scihub22266oqcxt.onion/10.1098/rsos.172187 C5936938!5936938!29765673     free     free     free Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=29765673&cmd=llinks): Failed to open stream: HTTP request failed! 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Success of sky-polarimetric Viking navigation: revealing the chance Viking sailors could reach Greenland from Norway |pdf=|usr=}}{{29765673}} gab.com Text Success of sky-polarimetric Viking navigation: revealing the chance Viking sailors could reach Greenland from Norway JO: R Soc Open Sci http://www.kidney.de/pget.php?&tw=1&pmid=29765673 #FOAvip According to a famous hypothesis, Viking sailors could navigate along the latitude between Norway and Greenland by means of sky polarization in cloudy weather using a sun compass and sunstone crystals. Using data measured in earlier atmospheric optical and psychophysical experiments, here we determine the success rate of this sky-polarimetric Viking navigation. Simulating 1000 voyages between Norway and Greenland with varying cloudiness at summer solstice and spring equinox, we revealed the chance with which Viking sailors could reach Greenland under the varying weather conditions of a 3-week-long journey as a function of the navigation periodicity ?t if they analysed sky polarization with calcite, cordierite or tourmaline sunstones. Examples of voyage routes are also presented. Our results show that the sky-polarimetric navigation is surprisingly successful on both days of the spring equinox and summer solstice even under cloudy conditions if the navigator determined the north direction periodically at least once in every 3?h, independently of the type of sunstone used for the analysis of sky polarization. This explains why the Vikings could rule the Atlantic Ocean for 300 years and could reach North America without a magnetic compass. Our findings suggest that it is not only the navigation periodicity in itself that is important for higher navigation success rates, but also the distribution of times when the navigation procedure carried out is as symmetrical as possible with respect to the time point of real noon. Twit Text FOAVip Success of sky-polarimetric Viking navigation: revealing the chance Viking sailors could reach Greenland from Norway ????R Soc Open Sci http://www.kidney.de/pget.php?&tw=1&pmid=29765673 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=29765673 #FOAvip English Wikipedia <ref>{{Cite pmid|29765673}}</ref> Success of sky-polarimetric Viking navigation: revealing the chance Viking sailors could reach Greenland from Norway #MMPMID29765673 Száz D; Horváth G R Soc Open Sci 2018[Apr]; 5 (4): ä PMID29765673show ga According to a famous hypothesis, Viking sailors could navigate along the latitude between Norway and Greenland by means of sky polarization in cloudy weather using a sun compass and sunstone crystals. Using data measured in earlier atmospheric optical and psychophysical experiments, here we determine the success rate of this sky-polarimetric Viking navigation. Simulating 1000 voyages between Norway and Greenland with varying cloudiness at summer solstice and spring equinox, we revealed the chance with which Viking sailors could reach Greenland under the varying weather conditions of a 3-week-long journey as a function of the navigation periodicity ?t if they analysed sky polarization with calcite, cordierite or tourmaline sunstones. Examples of voyage routes are also presented. Our results show that the sky-polarimetric navigation is surprisingly successful on both days of the spring equinox and summer solstice even under cloudy conditions if the navigator determined the north direction periodically at least once in every 3?h, independently of the type of sunstone used for the analysis of sky polarization. This explains why the Vikings could rule the Atlantic Ocean for 300 years and could reach North America without a magnetic compass. Our findings suggest that it is not only the navigation periodicity in itself that is important for higher navigation success rates, but also the distribution of times when the navigation procedure carried out is as symmetrical as possible with respect to the time point of real noon. äSuccess of sky-polarimetric Viking navigation: revealing the chance Vi(epmc).pdf DeepDyve Pubget Overpricing