| http://www.w3.org/ns/prov#value | - ated for the assumed performance of ancient vessels in sailing towards the wind ??? and indeed one of the important results of his research is a clear reason for assuming that they could normally sail only at 70 rather than 60 degrees to the wind; it???s a matter of modelling how frequently a vessel could match the record times recorded for different routes by Pliny the Elder ??? if ancient ships
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