<P> The Islamic calendar employs the Hijri era whose epoch was retrospectively established as the Islamic New Year of AD 622 . During that year , Muhammad and his followers migrated from Mecca to Yathrib ( now Medina ) and established the first Muslim community ( ummah ) , an event commemorated as the Hijra . In the West , dates in this era are usually denoted AH ( Latin : Anno Hegirae , `` in the year of the Hijra '' ) in parallel with the Christian ( AD ) and Jewish eras ( AM ) . In Muslim countries , it is also sometimes denoted as H from its Arabic form ( سَنة هِجْريّة , abbreviated هـ ) . In English , years prior to the Hijra are reckoned as BH ( `` Before the Hijra '' ) . </P>
<P> The Islamic calendar employs the Hijri era whose epoch was retrospectively established as the Islamic New Year of AD 622 . During that year , Muhammad and his followers migrated from Mecca to Yathrib ( now Medina ) and established the first Muslim community ( ummah ) , an event commemorated as the Hijra . In the West , dates in this era are usually denoted AH ( Latin : Anno Hegirae , `` in the year of the Hijra '' ) in parallel with the Christian ( AD ) and Jewish eras ( AM ) . In Muslim countries , it is also sometimes denoted as H from its Arabic form ( سَنة هِجْريّة , abbreviated هـ ) . In English , years prior to the Hijra are reckoned as BH ( `` Before the Hijra '' ) . </P>
which event marks the start of the islamic calendar
which event marks the start of the islamic calendar
the Hijra
the Hijra