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When Columbus presented his project to the Lisbon Small Academy, he didn't consider one thing. At the "Mathematical Junta" and at the University of Salamanca, scientists relied on Tuscanelli's geographic calculations. That meant a distance of 12,000 kilometres between western Europe and eastern Asia. No ship could have survived such a heavy transition. In Portugal, it was the opinion of Toscanelli, and in Spain, after the intervention of influential nobles of the Royal Court, believed the report of Columbus, about the length of the route 5710 kilometers.In my hypothesis, Paolo Toscanelli, as a professional cosmographer, might have been aware of some scientific works, especially on astronomy, including Nasiraddin Tusi's Zij Ilhani.Some scientists emphasize (mainly Azerbaijani, Tajik and Iranian scientists) that when Toscanelli was creating his map, he used some data from Nasiraddin Tusi. But in most cases they note that he referred to Claudius Ptolemy's data.