Zartosht No Diso marks the death anniversary of the prophet Zoroaster. For Zoroastrians, this day entails reflection of life, expression of gratitude for life, and a commemoration for the life of Zoroaster. Many will perform prayers and rituals at home and some will even go to a fire temple (if one is located in their proximity) to reflect upon Zoroaster's words of wisdom (generally through recitation of the Gathas. 

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Date in 2023: December 26th