The Atet (Ancient Egyptian: t) was the solar barge of the sun god Ra in the mythology of the ancient Egyptians. It was also known as the Mandjet (Ancient Egyptian: m?n?t), the Boat of Millions of Years (Ancient Egyptian: wj?-n-w), and, during the night, as the Mesektet (Ancient Egyptian: msktt).
Ra was said to travel through the sky on the barge, providing light to the world. Each twelfth of his journey formed one of the twelve Egyptian hours of the day, each overseen by a protective deity. Ra then rode the Atet through the underworld, with each hour of the night considered a gate overseen by twelve more protective deities. Passing through all of these while fending off various destructive monsters, Ra reappeared each day on the eastern horizon. Ra was said to travel across the sky in the Mandjet Barque through the hours of the day, and then switch to the Mesektet Barque to descend into the underworld for the hours of the night.
The progress of Ra upon the Atet was sometimes conceived as his daily growth, decline, death, and resurrection and it appears in the symbology of Egyptian mortuary texts.
In folklore, a boat of this kind is used by the sun god. Thus, as the pharaoh was a representation of the sun god on earth, the king would use a similar boat upon his death to travel through the underworld on their journey to the afterlife. One of the most well known examples of this is the Khufu ship, which was built and then buried at Giza along with Khufu and the rest of the items he would take with him to the afterlife.
Ra's ship appears in the 2016 film Gods of Egypt. In the film, the ship appears as a seafaring ship that drags the Sun across the sky.