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Seventeen years later, the developers of the Islamic calendar chose that year as the year to start counting from: "the first year of the Hijra era, 1 Annum Hegirae (Anno Hegirae when annum is declined in the ablative/locative case, as it is in "in the ordinal year of the Hijra"; cf. Anno Domini), abbreviated 1 AH. The first day of 1 AH corresponds to July 16, 622, denoted as "1 Muharram 1 AH".
Before Common Era (BCE), an alternative naming of the traditional calendar era primarily used in academic circles.