Karwa Chauth 2026 moonrise timings vary across the US, UK, Canada and other countries. Check city-wise timings for Washington, New York, Toronto, Vancouver, London and more. Karwa Chauth is an important Hindu festival during which many married women observe a day-long fast and pray for the long life, good health and well-being of their husbands. The fast is usually broken after the Moon rises, following evening prayers and traditional rituals.