Deepavali (also called Diwali in much of North India) came this year on the 11th of November, 2015. The date, as per the Gregorian calendar, is quite meaningless. But if you look at this tithi (date) according to the Hindu calendar, light strikes! It was Ashwin amavasya, of Krishna paksha. Which means it was a moonless night. As Rama and Sita, along with Lakshman, returned to Ayodhya, the stars were the only heavenly bodies that provided light. Thus the residents of Ayodhya, having waited for more than fourteen years for their prince, lit lamps to light the way. In more ways than one, they were dispelling the darkness that had persisted in Ayodhya for many years.
Yugas have passed, but the thought and tradition lives on.