Azar (Persian: آذر, Persian pronunciation: [ɒːˈzæɾ]) is the ninth month of the Solar Hijri calendar, the official calendar of Iran and Afghanistan. Azar has thirty days. It begins in November and ends in December by the Gregorian calendar. Azar corresponds to the Tropical Astrological month of Sagittarius. Azar is the third month of autumn, and is followed by Dey. The name is derived from Atar, the Zoroastrian concept of holy fire.