Nowruz

Nowruz is the traditional New Year's Day celebrated on Iranian calendars.

The name comes from the Persian words *now*, meaning "new," and *ruz*, meaning "day." It marks the arrival of spring in the Northern Hemisphere. This occurs during the vernal equinox, when day and night are nearly equal in length. Most celebrations fall between March 19 and March 22 on the Gregorian calendar. Today, many Persianate cultures celebrate this festival worldwide. It is a secular holiday for most, but remains a holy day for Zoroastrians, Baháʼís, and Ismaili Shia Muslims.

The timing of Nowruz relies on precise astronomical observations. In Iran, the Solar Hijri calendar uses an algorithmic system to track the sun. This system is highly accurate due to a sophisticated intercalation process. An intercalation system adjusts the calendar to keep it in sync with the seasons. The new year begins at midnight in the interval between two solar noons. This interval includes the exact moment of the March equinox. If the equinox occurs before noon in Tehran, that day is Nowruz. If it occurs after noon, the following day becomes the first day of the month Farvardin.

Mathematical precision defines the Iranian calendar's structure. In the 11th century AD, the scholar Omar Khayyam reformed the calendar. He fixed the start of the year to the vernal equinox. This ensured the New Year always aligned with the spring season. The calendar operates on a "great grand cycle" lasting 2,820 years. This cycle contains 2,137 normal years of 365 days. It also includes 683 leap years of 366 days. The average year length in this cycle is 365.24219852 days. This precision is much higher than the European Gregorian calendar.

Various traditions serve as preludes to the main festival. In Iran, Chaharshanbe Suri is celebrated on the eve of the last Wednesday before Nowruz. People participate in fire and water rituals, such as jumping over bonfires. They may also light fireworks or firecrackers. During this time, Iranians sing to the fire to ask for health and energy. They say, "my yellow is yours, your red is mine." This means they give their weakness to the fire and receive strength in return. In Azerbaijan, the preparations begin a month earlier. People celebrate one of the four elements—water, fire, earth, or wind—each Tuesday.

Social customs also involve community interaction and playfulness. A tradition called "spoon banging" occurs on the eve of Chaharshanbe Suri. In Iran, people wear disguises and go door-to-door banging spoons against bowls. They receive packaged snacks from their neighbors. In Azerbaijan, children leave baskets on doorsteps to collect candies and nuts. The Nowruz holidays in Iran last for thirteen days. On the thirteenth day, people celebrate Sizdah Be-dar. They leave their homes to have picnics in nature.

It is also a time for playing jokes and pranks.

Nowruz has a history spanning over 3,000 years. Its roots are found in ancient Iranian religions like Zoroastrianism and Mithraism. Mythology credits the mythical King Jamshid with founding the festival. According to the *Shahnameh*, Jamshid saved mankind from a deadly winter. He sat on a gem-studded throne in the heavens and shone like the sun. People gathered and called this the "New Day." Historically, the festival was important during the Achaemenid Empire. At Persepolis, kings from different nations would bring gifts to the King of Kings.

The festival connects human culture to the cycles of the natural world. It marks the transition from winter to the growing season. This is reflected in the diverse ways people express joy. Some use celebratory dances, while others engage in poetry recitations. The United Nations officially recognized the "International Day of Nowruz" in 2010. This recognition highlights its global cultural significance. Whether through the setting of a *Haft-sin* table or a community dance, Nowruz celebrates renewal.

It remains a vital link to ancient history and the rhythm of the Earth.