Happy Mesopotamian New Year! Akitu was celebrated at the start of the year from Sumerian times until the end of Babylonian civilization, and naturally the details changed significantly over the course of thousands of years. However, this is something of a reconstructed outline of what went on, with attention particularly paid both to the cultural context of many of the events, as well as to how some of those might be adjusted for modern neo-pagans attempting to reconstruct the holiday.
