Science as Divine Signs: Al-Sanūsī’s Framework of Legal (sharʿī), Nomic (ʿādī), and Rational (ʿaqlī) Judgements

This article examines the Ashʿarī theological framework of Imam Abū ʿAbd Allāh Muḥammad ibn Yūsuf al-Sanūsī (d. 1490) and its potential for shaping contemporary Muslim engagement with science. At the heart of al-Sanūsī’s thought is a tripartite typology of judgements—legal (ḥukm sharʿī), nomic (ḥukm ʿādī), and rational (ḥukm ʿaqlī)—as articulated in The Preliminaries of Theology (al-Muqaddimāt). This classification distinguishes between rulings grounded in revelation, patterns observed in nature, and conclusions drawn from reason. Unlike other theological approaches, al-Sanūsī’s model integrates core Ashʿarī doctrines such as radical contingency, occasionalism, and divine command theory, offering a coherent synthesis of metaphysics, empirical inquiry, and ethics. Building on recent scholarship that re-engages with Ashʿarī theology in the context of Islam and science, this article argues that al-Sanūsī’s schema offers a meta-framework—one that positions science not merely as an object of analysis but as a locus for theology.