ABSTRACT
In the majority of his writings, not only in optics but also in astronomy and statics, Ibn al-Haytham (d. after 1040) pursued the realisation of a programme to reform these physical disciplines, which brought him clearly to take up each discipline in turn. The founding action of this reform consisted in breaking from a previous conception of the relationships between mathematics and physics. In this paper, we examine this new position in both astronomy and optics.
