Cyrus the Great Day (Entry into Babylon), Aban 7, commemorates the entry of Cyrus the Great, founder of the Achaemenid Empire, into the city of Babylon in 539 BCE. On this historic occasion, Cyrus entered Babylon without battle, ending Babylonian rule. This event is considered a turning point in Iranian and regional history, and is often cited as an example of a different approach to conquered peoples and the issuance of a charter of rights for nations. In the Shahanshahi calendar, Aban 7 was designated as Cyrus the Great Day to remember this significant event and the role of Cyrus in Iranian history. This observance was officially added to the calendar in year 21 of the Shahanshahi era to honor Iran’s cultural and historical heritage. On this day, some Iranians visit the tomb of Cyrus at Pasargadae or hold commemorative ceremonies in his memory. The entry of Cyrus into Babylon not only brought major political changes to the region but also had far-reaching cultural and social consequences. The Cyrus Cylinder, issued after this event, is recognized as one of the earliest declarations of human rights. In recent years, Aban 7 has gained attention as a symbol of Iranian national and historical identity and is observed in various cultural and social circles.
