事件伊斯兰教公元622 / 希吉拉历元年622 CE / year 1 AH
希吉拉（迁徙）The Hijra (Emigration)
622 年自麦加迁至叶斯里卜/麦地那；伊斯兰纪元起点。H 轨：政治避难与共同体重建；T 轨：奉命迁徙与信仰考验。622 move from Mecca to Yathrib/Medina; epoch of the Islamic calendar. H-track: political refuge and community rebuilding; T-track: commanded emigration and trial of faith.