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."[4]
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