The time of Islamic festivals is calculated according to local sightings of various phases of the moon and the dates given below are approximations which are subject to change each year.
Iran has a variable climate. In the northwest, winters are cold with heavy snowfall and subfreezing temperatures during December and January.
Although Iran political structure is a republic system, it may seem different from other similar political systems. Iran political system's origin and roots are the reason beyond such a uniqueness.