Over time, Shemu morphed into its current form and its current date, and by the time of the Islamic conquest of Egypt, the holiday was settled on Easter Monday. The Islamic calendar being lunar and thus unfixed relative to the solar year, the date of Sham el-Nessim remained on the Christian-linked date. As Egypt became Arabized, the term Shemu found a rough phono-semantic match in Sham el-Nessim, or "Smelling/Talking In of the Zephyrs," which fairly accurately represents the way in which Egyptians celebrate the holiday.