Tir

Tir is named for Tishtrya — the bright star Sirius in Zoroastrian cosmology — who battles the demon of drought and brings the rains. The irony of naming a summer month after rain speaks to Persian wisdom: in the hottest time, you invoke water. The month contains Tirgan, an ancient water festival of joy.

In the Avestan myth, Tishtrya does not win his battle alone. He needs strength — the strength given to him by worship, by the living naming and honoring him. When they do, he overcomes Apaosha, the demon of drought, and the rains follow. The festival of Tiregan carries this logic into practice: water is thrown freely, wishes are tied to reeds and released into rivers. The ancient Persians understood that to ask for something, you must first practice it.

Sirius rises heliacally over the Iranian plateau in the weeks corresponding to this month — one of the most watched astronomical events in the ancient world, tracked by Mesopotamian and Egyptian observers for millennia. The Persian calendar gave it thirty days. No other civilization named a month for a single star. They did it because they knew exactly what Sirius's arrival meant: the heat had reached its peak, and somewhere above it, the force that brings rain was winning.