Sepanta Niknam added that the festival was celebrated simultaneously by Zoroastrians across the country.
Sadeh is a mid-winter celebration observed by Zoroastrians on the Iranian month of Bahman 10. It includes building a large bonfire and is therefore also known as Azar Jashan (feast of fire). The bonfire is to drive back the winter in defiance of Ahriman (Satan). It is a deeply religious festival.
The origins of the festival is somewhat ambiguous and there is no trace of this ceremony in the Zoroastrian holy texts. However, some historians suggest the ceremony existed even before Zoroastrianism, the world’s oldest monotheistic religion.
Some say Sadeh is a festivity to honor fire and to defeat the forces of darkness, frost, and cold. Several mythological accounts, however, connect the festival to the origins of human beings. According to Persian mythology, Houshang, the second king of the world, discovered the fire when he tried to hit a dragon with a stone. He reportedly threw a flintstone that struck against another flint stone causing a spark and generating fire.
This celebration is always held in groups by building a big fire, and the participants in this ritual pray.