Etymology of Pradosha - Pradosha is the son of Kalpa and Dosha. He had two brothers namely Nishita and Vyustha. The three names mean beginning, middle and end of night. The day from new moon day to full moon day is called "Sukla Paksha" and days from every full moon day to new moon day are called "Krishna Paksha". During every month and during every Paksha, the point of time when Triyodashi (13th day of the fortnight) meets the end of Dwadasi (12th day of fortnight) is called Pradosha. During Pradosha, Nandi (the sacred bull of Shiva) in all the Shiva temples in South India is worshipped. The festival idol of Shiva with Parvathi in a seated pose on Nandi is taken as a procession in the temple complex. The Story of Pradosham Once upon a time the angels ( Indra and his subordinates) were cursed that their colour would change and they would become demons. therefore they ran to seek refuge from Lord Vishnu. Lord Vishnu asked them to churn the milk ocean