Although for the majority of Iranians Sadeh has no religious significance and no specific rituals are involved other than lighting fires at sunset and having a cheerful time, Iranians of all faiths make a collective effort at this day to keep up with their ancient traditions and to celebrate the preciousness of creation.
Sadeh has a complex history and two different days were observed for the festival's veneration. In addition to 50 days (100 days and nights) before the beginning of the new year (or hundredth day after the gahambar of Ayathrima), already noted, the other celebration marked the hundred day before the religious new year (religious new year is not necessarily the same as spring new year). It is not clear why there are two Sadeh Festivals and why different regions have had different dates. Many of Zoroastrian holy days were and are celebrated twice; this is most likely caused by the calendar reform in the 3rd century AD.
