Diwali the “festival of lights” is an ancient Hindu festival celebrated in autumn (northern hemisphere) or spring (southern hemisphere) every year. Diwali is one of the largest and brightest festivals in India. The festival spiritually signifies the victory of light over darkness, knowledge over ignorance, good over evil, and hope over despair. Its celebration includes millions of lights shining on housetops, outside doors and windows, around temples and other buildings in the communities and countries where it is observed. The festival preparations and rituals typically extend over a five day period, but the main festival night of Diwali coincides with the darkest, new moon night of the Hindu Lunisolar month Kartika. In the Gregorian calendar, Diwali night falls between mid-October and mid-November.