Katip Chelebi was born in 1609. His real name was Mustafa, and in the eastern and western books he was called as “Hadgi Kalfa” and “Hadgi Caliph”. He entered to Divan Secretary in his 17^th year. His father was a soldier and he joined the wars of Tercan and Baghdad. Katip Chelebi came to Istanbul after his father’s death in Mosul. He attended the lectures of famous scientists. He went to Baghdad, Aleppo, Hedjaz and Revan with the Ottoman Army and increased his knowledge and experience. In 1638, he inherited a prosperity from one of his relatives and he resigned from his governmental duty. He had read all the books he had wanted and had medrese education. Katip Chelebi learnt French and Latin languages besides the eastern languages. Hence, he followed the scientific developments in the western world. His book Cihannuma is about the geography and the history of the countries from Japan to Iraq and Erzurum Frontier, it had been served as a source to the western scientists. He had gone beyond the boundaries his century’s science, he searched the evidences to prove the earth’s round shape, he had translated western works about astronomy. He was one of the founders of the modern science. He died in 1657.

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