which event marks the start of the islamic calendar
Islamic calendar 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[1] from its Arabic form ( سَنة هِجْريّة, abbreviated هـ). In English, years prior to the Hijra are reckoned as BH ("Before the Hijra").[2]
Rosh Hashanah Rosh Hashanah is a two-day celebration which begins on the first day of Tishrei, which is the seventh month of the ecclesiastical year. It marks the beginning of the civil year, according to the teachings of Judaism, while the first month Nisan, the passover month, is the traditional anniversary of the creation of Adam and Eve, the first man and woman according to the Hebrew Bible, and the inauguration of humanity's role in God's world. According to one secular opinion, the holiday owes its timing to the beginning of the economic year in Southwest Asia and Northeast Africa, marking the start of the agricultural cycle.[2]