A Comparative Study of "Motion" and "Time" in the Philosophical System of Ibn Sina and Sadra

The two philosophical systems of Ibn Sina and Sadra have provided different explanations of the reality of time and its relation with movement. In Ibn Sina's philosophical view, time is an accidental category, a nonon-static continuous quantity [e1] . This viewpoint faces several important challenges:first, regarding the concept and reality of time as quidditive; second, separating the reality of time from the reality of material beings, which requires the denial of the real assignment of time to material beings; third, the incompatibility between the "denial of the external existence of cuttingmovement" and " interpreting time as the amount of cutting-movement "in Ibn Sina’s philosophical system. To overcome these challenges, Mulla Sadra
has put forward a new perspective. In his view, the concept of motion is a philosophical secondary intelligible, and its reality is not a cognation of quiddities. Motion and time exist with one being, and time is the amount of the substantial  ovement of material objects.