Muḥammad ibn ʿAbd Allāh Nasṭūlus (; known as Nasṭūlus, but also referred to as Basṭūlus) was a 10th-century astronomer. He is known for making one of the oldest surviving astrolabes, dated 927/928, as well as of another partially preserved astrolabe that bears his signature, "Made by Nasṭūlus in the year 315" of hijra (925).
Very little is known about Nasṭūlus. His full name, based on a testimony given by a contemporary astronomer, Abu Sa'id al-Sijzi, indicates that he was a Muslim, but some modern historians have suggested that his foreign last name may indicate that he was Greek or Nestorian.
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External links Image of one of the two astrolabes made by Nasṭūlus from the Al-Sabah Collection website Description of a manuscript dated Jumadi II 625 AH (May 1228) from the exhibition Scanning the Skies: A Virtual Exhibit of Astronomy Manuscripts at the University of Pennsylvania, showing a description of one of Nasṭūlus's astrolabes