Zartosht No-Diso

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Zartosht no-diso, or Zarthost no deeso, is a major holiday of the Zoroastrian religion. It is a commemoration of the Prophet Zarathushtra's death anniversary, and is observed on the 11th day (Khorshed) of the 10th month (Dae). In the seasonal calendar, Zoroaster's death anniversary falls on December 26th.

It is an occasion of mourning with lectures and discussions held on the life and works of the Prophet. Special prayers are recited and the faithful visit the Fire Temple to pray.

Zoroaster’s death is not mentioned in the Avesta. In Shahnama 5.92,^[1] he is said to have been murdered at the altar by the Turanians in the storming of Balkh.