Presently, while it is largely a secular holiday for most celebrants and enjoyed by people of several different faiths and backgrounds, Nowruz remains a holy day for Zoroastrians, Baháʼís, and some Muslim communities.As the spring equinox, Nowruz marks the beginning of spring in the Northern Hemisphere. The moment at which the Sun crosses the celestial equator and equalizes night and day is calculated exactly every year, and families traditionally gather together to observe the rituals.