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The town of Bostanabad in Bostanabad County, located 55 kilometers from Tabriz, was built on the site of the old city of Ojan whose name has been mentioned in many history books since the sixth century AH.
An article by Harald Motzki appeared in the Journal of Near Eastern Studies that mentioned the Musannaf of `Abd al-Razzaq al-San`ani as a source of authentic ahadith of the first century AH.
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".