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Before the advent of Islam in the Arabian Peninsula, a pre-Islamic 12 month calendar was in use. In addition to the 12 months listed below, there was also what was, in effect, an intercalary month, referred to as an-nasi'. Various interpretations of this word have been given, among them a "postponing". Use of this intercalary month meant that, in practical terms, the pre-Islamic calendar can be considered to have been a lunar-solar calendar, unklike the Islamic calendar which is strictly lunar. This had the effect of the maintenance of a more consistent relationship between the months and the seasons of the year. Some sources say that the Arabs followed the Jewish practice and intercalated seven months over nineteen years, or else that they intercalated nine months over 24 years; there is, however, no consensus among scholars on this issue. Referring to Abū Rayḥān al-Bīrūnī (d. ca. 442 A.H./1050 C.E.), it has been posited that this intercalation was effected in order to accomodate the scheduling of seasonal trade cycles with annual pilgrimages, as such pilgrimages were occurring at least two hundred years prior to the advent of Islam. Sources for the names of these pre-Islamic months are Al-muntakhab min gharīb kalām alʿarab of Abū al-ḥasan ʿalī bin al-ḥasan bin al-ḥusayn al-hunāʾī ad-dūsā (d. 309 A.H./921 C.E.)(known more commonly as "Kurāʿ an-naml") and Lisān al-ʿarab of Ibn Manẓūr (d. 711 A.H./1311 C.E.).