The Location of America Was Known to Columbus

According to official documents, Ch. Columbus traveled to coasts of the New World for four times - in 1492-1493, 1493-1496, 1498-1500 and 1502-1504 - and thought that he had discovered Asia during all travels. These assumptions may be met in all sources. Besides it, there is another "skeptic" conception too (since the middle of XVI century). The French physician Jan Fernell (1497-1558), who was interested in astronomy, wrote that, the length of the Earth's outline was...
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According to official documents, Ch. Columbus traveled to coasts of the New World for four times - in 1492-1493, 1493-1496, 1498-1500 and 1502-1504 - and thought that he had discovered Asia during all travels. These assumptions may be met in all sources.

Besides it, there is another "skeptic" conception too (since the middle of XVI century). The French physician Jan Fernell (1497-1558), who was interested in astronomy, wrote that, the length of the Earth's outline was 39816 km and its radius was 6337 km. It means that, Toscanelli had made a mistake. According to his calculations, the length of the Earth's outline was 29000 km.

That's why, Columbus didn't agree with the report of the Florentine scientists and used measurement of the greek scientist Eratosthene sand geographical coordinates of the Earth offered by Tusi.

As he was interested in astronomy, he had taken into account calculations of Eratosthenes, Poseidon, Al-Khwarizmi, Al-Biruni, Tusi and Toscanelli before starting his travel.

I think that, Christopher Columbus couldn't agree with thoughts of the Florentine cosmographer. First of all, well-known sea traveler couldn't agree with length of the Earth's outline. It means that, Asia isn't situated in the Atlantic Ocean at 10000-12000 km away from Canaries in the west as Paolo Toscanelli thought. Christopher Columbus had determined that, land area located in the west of the Atlantic Ocean was at 4500-5000 km away from Europe.

It proves that, mentioned territory was another land, which wasn't known in the Old World.

The Azerbaijani scientist Nasiraddin Tusi founded great observatory in Caucasus. After analyzing his astronomical tables, Soviet scientists found out that, Tusi knew geographical coordinates of America. It proves that, Christopher Columbus discovered America two centuries later.

Christopher Columbus wrote that the Aran Islands were on 90-degree meridian in the Eastern Hemisphere. Mentioned island is situated below the equator, between Arabian and Persian Gulfs. It may be Sheisel Islands only. The longitude of those islands was 530 with regard to the Greenwich Meridian. Completion of this measurement is 340. Christopher Columbus's and Nasiraddin Tusi's results are almost same. It means that, the well-known traveler had got acquainted with the astronomical table made in Maragha. Mentioned table consisted of coordinates of 256 cities. These cities included Cordoba of Spain and Peking of Chine.