Esoteric Calendar
Mesopotamian Calendar 2026
Akitu, the Sacred Marriage, Tammuz mourning, and the oldest recorded calendar system in human history.
January
February
March
April
May
June
July
August
September
October
November
December
Cyclical Rhythms
These cycles repeat throughout the year. Their dates shift with the moon and stars.
Browse by Tradition
The oldest written calendar
Mesopotamia gives us the earliest recorded festival calendar, set down in cuneiform more than four thousand years ago. The Sumerians, Babylonians, and Assyrians kept a lunar year of twelve months, corrected with leap-months, and crowded it with temple rites for the gods of the city. Much of our own week and our division of the hour descends from their counting.
The great festival was Akitu, the twelve-day Babylonian New Year, when the king’s power was renewed and the creation epic was recited to re-enact the god Marduk’s victory over chaos. Darker rites tracked the planet Venus as the goddess Inanna descended into the underworld and returned, mirroring the star’s disappearance and reappearance in the sky.
What this calendar holds
The entries gather the festivals of Sumer and Babylon, from the New Year procession to the mourning for Tammuz and the rites of the underworld queen Ereshkigal. This is the root system of the religious calendar, the place where keeping sacred time was first written down.