%3b_al-Risala_al-Kamaliya%2c_Safavid_Iran%2c_dated_26_June_1520.jpg) Manuscript of al-Kashi'sal-Risala al-Kamaliya. Copy created inSafavid Iran, dated 26 June 1520 | |
| Author | Jamshid Kashani |
|---|---|
| Original title | سُلَم السَماء |
| Language | Arabic[1] |
| Subject | Astronomy |
Publication date | 1407; 618 years ago (1407) |
| Publication place | Iran |
Sullam al-Sama', also known asResaleh-ye Kamaliyyeh (Arabic*:[1]سُلَم السماء, Transliterated as Sǒllam os-Samā'), meaning "The Ladder of the Sky" or "The Stairway of Heaven",[2] is anastronomical treatise[3] written by thePersian mathematician and astronomerJamshid Kashani in 1407 about the determination of the distance and size ofheavenly bodies such as theEarth, theMoon and theSun.
Kashani finished writing the book on 1 March 1407. He mentioned in 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 likeMercury orVenus to the Sun. So I decided to write this book and I named it Sullam al-sama' to be a guide for the wise."
The book shares its title witha TV series about Kashani produced in Iran in 2008.