Chahārshanbe-Sūri (Persian: چهارشنبهسوری, UniPers: Câršanbe-Suri), pronounced Chārshanbe-Sūri (Persian: چارشنبهسوری) is an ancient Persian festival dating at least back to 1700 BCE of the early Zoroastrian era. The festival of fire is a prelude to the ancient Norouz festival, which marks the arrival of spring and revival of nature. Chahrshanbeh Soori, is celebrated the last Tuesday night of the year. The word Chahar Shanbeh means Wednesday and Suri is red. Bonfires are lit at sunset and the idea is to not let the sun set. Bonfires are lit to keep the sun alive till early hours of the morning. The celebration usually starts in the evening. On this occasion people make bonfires on the streets and jump over them. The young shoot fireworks before and during Chaharshanbe Soori (literally: Red-Colored Wednesday).