Homage to Tishtrya – The Brightest Star

26th November, 2023, marks Roj Tir of Mah Tir, or the Parab of Tir, as per the Shahanshahi calendar. This auspicious day is observed as the feast of Tirgan. Since the Shahanshahi calendar is not intercalated, this festival of rain now falls during autumn. Regardless, it is a very special occasion to offer thanks to Tir Yazata for keeping us all free from Apaosa – the demon of draught.

Across civilizations, the celestial path of Sirius was observed and revered. Its journey inspired reverence, leading to its classification as a sacred entity. The appearance of Sirius in the night sky was often accompanied by grand feasts and joyous celebrations, paying homage to its profound influence and celestial splendor.


Tir, or Tistar (Avesta Tishtrya), is the Divinity presiding over the Star Sirius (Greek Seirios which means glowing or scorching) or the Dog Star which is the brightest star visible from all parts of the earth in the night sky. Sirius is colloquially called the ‘Dog Star’, on account of its prominence in the constellation of Canis Major or Big Dog.

In the Tir Yasht, Tistar-Tir is venerated as radiant, glorious and invoked to bring rain, enhance harvest and keep the demon of draught at bay. Also, according to Tir Yasht (8.44), just as Ahura Mazda has ordained that Zarathushtra oversee the affairs of human beings on earth, so also Ahura Mazda ordained that Tishtriya oversee the workings of the stars.

In the Tir Yasht, we particularly invoke Tishtrya as, “Provider of rain, helpful and health giving”. In fact, Tishtrya yazata affirms in the same litany: “If men would worship me with the Yasna in which my own name is invoked, then I would render the world prosperous and fertile by showering rain”. The Tir Yasht also records the victory of Tishtrya over Apaosha, the demon of drought and ensuring happiness not just for people but all vegetation and animals.


Tishtriya or Sirius is our galaxy’s brightest star in the night sky. It is approximately eight and half light-years away, which means light from this star takes about eight and a half years to reach earth as compared to the sun of our solar system whose light takes about eight and a half minutes to reach Earth. Visible on a clear sky to the naked eye, it is seen to emit a mild violet tint.

In the ancient Veda this star was known as the Chieftain’s star; in other Hindu writings, it is referred to as Sukra, the Rain God, or Rain Star. The Dog Star is also described as, “he who awakens the gods of the air, and summons them to their office of bringing the rain.

By the ancient Egyptians, Sirius was revered as the Nile Star, or Star of Isis. Likewise, ancient Egyptians observed that in the month of July, with the heliacal rising of the Star Sirius (Heliacal rising means the first night that a star is seen in the eastern horizon, just before dawn) the Nile generally started to flood and bring fertility to the land. Thus, the flood and the rising of Sirius also marked the ancient Egyptian New Year. The ancient Greeks also observed that the appearance of Sirius or the Dog Star heralded the hot and humid summer season causing plants to wilt and men to tire. The season following the star’s appearance came to be known as the ‘Dog Days of summer’, an expression still in use.

The festival of Tirgan is one of the three most widely celebrated seasonal festivals of ancient Iran. While Navruz (Mah Fravardin, Roj Hormuzd) celebrates renewed life and the warmth of spring after the cold winter season and Meherangan (Mah Meher, Roj Meher) commemorates harvest during autumn, Tirangan (Mah Tir, Roj Tir) welcomes the heat of summer and life-giving rain.

Tiragan is mainly associated with the legend of the arrow (tir), which is briefly alluded to in the Tir Yasht: “We honor the bright, khwarrah (glory) endowed star Tishtrya who flies as swiftly to the Vouru-kasha sea as the supernatural arrow which the archer Erexsha, the best archer of the Iranians, shot from Mount Airyo-xshutha to Mount Xwanwant. For Ahura Mazda gave him assistance; so, did the waters …”

The legend of Erexsha (modern Eruchsha) or Pahlavi Arish Shivatir i.e Arish of the swift arrow is also referred to in other texts like Firdausi’s Shahnameh (Book of Kings) and MirkondHistory of the Early Kings of Persia, translated by David Shea. According to these later texts, Erekhsha or ‘Arish of the swift arrow’, was the best archer in the Iranian army. When Shah Minochihr and Afrasyab of pre-historic Iran decided to make peace, and fix the boundary between Iran and Turan, it was agreed that Arish would ascend a Mountain and from the peak fire an arrow and the place in which the arrow would land would form the boundary between the two kingdoms.

Arish thereupon ascended the mountain, and discharged an arrow, the flight of which continued from the dawn of day until noon, when it fell on the banks of the Jihun (the Oxus or Amu Darya in Central Asia, in modern times the border around Tajikistan and Afghanistan). The day was Tir Roj of Tir Mah. Thus, the festival of Tirangan also celebrates the spirit of peace and freedom.

The Persian Rivayat (essentially correspondence between the Zoroastrian Priests of Navsari in India and the Zoroastrian priests of Yazd in Iran) speak of a great draught in Iran as a result of the conflict between Iranians and Turanians. Shah Faridoon had segregated Iran and Turan under a covenant. However, the Turanians under Afrasiab breached the covenant. The arrow was released on Roj Tir of Mah Tir and when Afrasiab and the Turanians left Iran it took them ten days to reach Turan. The tenth day was Roj Govad (dedicated to the good wind) and it rained heavily on that day and ended eight years of draught and ushered peace and prosperity for both Iran and Turan.

Late Professor Dr. Mary Boyce, in her book, ‘Persian Stronghold of Zoroastrianism’ refers to the custom among Zoroastrians of Yazd in Iran, tying rainbow-colored bands on their wrists on Tirangan for ten days and then throwing them in a stream. These colorful bands were worn as good-luck charms and during this period children in particular found great joy in swimming or splashing around in the local village streams. The Rivayat however records that priests used to write a Nirang (short prayer) which members of the community wore on their wrist or arm on Roj Tir of Mah Tir and removed it after ten days on Roj Govad and cast it into running brooks and streams, symbolically casting all calamities (particularly draught and hunger) to the flowing waters to carry away.

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