While there have been a number of descriptions and interpretations of boys' initiation rituals, Audrey Richards's classic study of initiation rites among the Bemba remains one of the few studies to deal in detail with the initiation of girls into adult life. Dr Richards observed the entire chisungu or female initiation rite, an almost continuous series of complex ceremonies las...(展开全部)

The prophet Muhammad and the early Islamic community radically redefined the concept of time that they had inherited from earlier religions' beliefs and practices. This new temporal system, based on a lunar calendar and era, was complex and required sophistication and accuracy. From the ninth to the sixteenth centuries, it was the Muslim astronomers of the Ottoman, Safavid and ...(展开全部)