Nasiraddin Tusi and development of astronomy in Azerbaijan

This VI part of sketches from the series "The genius of science Muhammad Nasiraddin Tusi": In the Islamic world the observatories appeared both before and after Maraghi, but none of them came close to the achievements of the latter, although measurements of almost as famous Samarkand observatory are considered more accurate.Maragin Observatory was the 5th in human history as an observatory. However, in all previous observatories observations of celestial bodies were not put on a scientific basis. Rather, they were chaotic in nature and Tusi, with his inherent craving for systematization and a systematic approach, took up the matter thoroughly and comprehensively. He created the most perfect mathematical apparatus for the time and approached observatory astronomy with great responsibility and purposefulness.After the beginning of research at the observatories: Chinese in Beijing, Ulugh Beg in Samarkand, Danish Thiho Brahe and Indian in Jaipur, instruments and tools invented directly at the Maraga Observatory were used and improved.