Observed on the day Sun enters sidereal sign 1 of 12.
Maha punya kaal is the 8 hours from the solar transit; punya kaal extends to 16 hours. Observances are most auspicious within these windows.
Puthandu (Tamil New Year) is one of the festivals observed in the Hindu calendar. A detailed account of its mythology, significance, and rituals is being prepared.
Computed for India (Asia/Kolkata) using local sunrise, sunset and astronomical positions.