Bīrjandī, Niẓām al-Dīn ʿAbd al-ʿAlī b. Muḥammad b. Ḥusayn (d. 934/1528), known as Fāḍil-i Bīrjandī, was a mathematician, astronomer and a prolific author of commentaries on books on astronomy.

Bīrjandī was a prominent figure of his time (Kh^ʷāndamīr, 4/615–616; Mullā Muẓaffar, 2). It seems that he was not happy with the circumstances of his time and at some point he calls himself someone who has ‘chosen the isolation of being unknown and in grief ’ (see Sharḥ, 2). According to Kh^ʷāndamīr (4/616), Bīrjandī learnt religious scie…