The Sun-singers of Akhet, (TV: The Rings of Akhaten) or Akhet System, (WC: Zygon Stats) was a star system of seven planets. Its inhabitants worshipped Akhaten, which they referred to as the Old God. They believed that life in the universe originated there. The Eleventh Doctor called their creation myth "a nice story".
Once every thousand years the Rings of Akhaten aligned and the people celebrated with the Festival of Offerings.
A key feature of the system was the Pyramid of the Rings of Akhaten, a holy site located in a small asteroid within the Rings of Akhaten.
The people of this system used emotionally charged items as a currency.
The First Doctor visited with his granddaughter. At a time when the Eleventh Doctor and Clara Oswald visited the festival, they also saw, among other species, some Pan-Babylonians, a Lugalirakush, some Eukanians, a Hooloovoo, a Terraberserker from the Cadonian Belt, an Ultramanta and Dor'een. (TV: The Rings of Akhaten)