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Sullam al-sama'
''Sullam al-sama also known as Resaleh-ye Kamaliyyeh (Arabic
*:〔Many of the medieval Persian books on mathematics or astronomy were written in Arabic because of the popularity and majority of use of Arabic language among Iranian scientists those days.〕 سُلَم السماء, Transliterated as Sǒllam os-Samā') meaning "''The Ladder of the Sky''" or "''The Stairway of Heaven''"〔http://www.iranchamber.com/personalities/jkashani/jamshid_kashani.php〕 is an astronomical treatise 〔(Britannica online , Kashi entry )〕 written by the Persian mathematician and astronomer Jamshid Kashani in 1407 about the determination of distance and size of the heavenly bodies such as the Earth, the Moon and the Sun.
==The text==
Kashani finished the writing of the book on 1 March 1407. He mentioned at the preface of another book of his, ''Meftah al-Hesab'' (lit. "The Key of Arithmetic") that: "I studied all books on astronomy that the scientists had written before me and i realized that they had many difficulties and disagreements about the determination of the size or distance of the astronomical objects like Mercury or Venus to the Sun. So I decided to write this book and I named it Sullam al-sama' to be a guide for the wise."〔(Kashi Entry in Dehkhoda online Dictionary )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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