|Also known as||'The Ladder of the Sky'|
|Written by||Hamed Anqa|
|Directed by||Mohammad Hossein Latifi|
Mohammad Javad Omidi
Ahmad Allameh Dahr
|Country of origin||Iran|
|No. of episodes||21|
|Running time||45 minutes|
|Original network||IRIB TV1|
|Original release||August – September 2009|
Nardebām-e Asmān  (Persian :نردبام آسمان, The Ladder of the Sky) is an Iranian TV series directed by Mohammad Hossein Latifi and produced in 2008. It is a historical and biographical series about the life and career of Iranian mathematician and astronomer Jamshid Kashani, also known as Jamshid Al-Kashi. It was broadcast during the month of Ramazan (August–September) of 2009 in Iran. The title of the Series is that of Kashani's astronomical treatise, with the Arabic title Soll'am-os-Samā' (literally meaning The ladder of the sky), which he completed on 1 March 1407 CE in Kashan.
The Series narrates the life and the scientific works of the Iranian mathematician and astronomer Ghiyath al-Din Jamshid Kashani (1380–1429). It covers the entire life of Jamshid Kashani, from his birth in Kashan, until his death in Samarkand where he lived during the later part of his life, on the invitation of the Timurid ruler of Samarkand Ulugh Beg, as the designer, architect and director of the Samarkand observatory.
- Vahid Jalil'vand as Jamshid Kashani
- Rahim Norouzi as Ulugh Beg
- Borzoo Arjmand as Moeen al-Din, son of Jamshid's sister and later a respected medical doctor in the Court of Ulugh Beg in Samarkand
- Shabnam Gholikhāni as Veys, Jamshid's wife
- Vishkā Āsāyesh as Āy Bānu, daughter of an alchemist and astrologer who later became an assistant to Jamshid in the Samarkand observatory
- Dāriush Kārdān as Masoud-e Tabib, Jamshid's father
- Hasan Pourshirazi as Safdar, Jamshid's spiritual teacher and guide
- Mohammad-Rezā Dāvoudnejād as The Sheriff
Although the subject matter of the series is a historical one, almost all the dialogues throughout the series are in modern style and not strictly formal; even in the Court of Ulugh Beg courtly language is largely avoided. With this choice, the director has attempted to keep the series appealing to younger viewers who otherwise might consider the series as old-fashioned and greyish.
- The name Nardebām-e Āsmān coincides with the Persian translation of the title Soll'am-os-Samā' (سُلّمُ السَماء) of a scientific work by Jamshid Kashani written in Arabic. In this work, which is also known as Resāleh-ye Kamālieh (رسالهٌ كماليه), Jamshid Kashani discusses such matters as the diameters of Earth, the Sun, the Moon, and of the stars, as well as the distances of these to Earth. He completed this work on 1 March 1407 CE in Kashan.
- This is the same name as the Vis in the epic story of Vis and Ramin.