_Geometrical analysis of architectural drawings in the Shah-mosque Isfahan

The golden number has been one of the most important measures of beauty from ancient Greece till now. Although the reason still unclear, it is certain that the golden ratio has a direct correlation with beauty. This nice feeling can come from listening to a musical piece or watching a visual art, which is based on this wondrous number. Although the golden number is more suitable from beauty or harmony’s perspective, for some researches it is a requirement to develop Architectural designs. Therefore, in this article a masterpiece (Shah-mosque Isfahan) was investigated to find its golden relations. This mosque was chosen because of the precise and harmonious proportions. In this research: plan, sections, facade and decorations of ceiling tiles in main dome, were analyzed by Phi-matrix software in which, existence of the golden ratio has been proven undoubtedly.