The general view by historians is that the ancient Sumerians had a list of kings that lasted 120 sars, a sar representing 3,600 years, which was supposed to be originally the orbital timing period of the planet Nibiru that the Sumerians claim to have come from. If it was orbiting our sun it would be somewhere near 250 AU from the sun, which would be way to cold for life to exist there from normal irradiation froom our sun, but if it was a much larger hotter star natural illumination would not be a problem, but stellar longevity may be. A vastly hotter star would most likely have a much shorter life, burning through its store of hydrogen much faster. An rough estimate of this proportion is about a 2:4:8 ratio. This means that a star that has 2 times the diameter will put out 4 times the radiation at earth distance, have 8 times the mass and an 8th of the lifespan at the same distance.
This means that to get a solar type irradiation at 250AU the star would need to be around 50 times the mass of our sun and a stellar lifetime of about 1 million useful years, so it’s unlikely that Sumerian life would have developed there, but move from a more stable or previous close by sun. Moving there they would have known that a deluge was coming and prepared for the next move.
But, it could be that this is a simple misinterpretation of the concept of the sar, being one of travelling long distances from something like a remote star at near light speeds, resulting in a sar period representing an elongated time of 3,600 years in normal space.
We have the antediluvian rulers that were in power before the ‘Great Deluge’, a period that was supposed to have lasted 241,200 years, but if we take the view that the original people of Sumer were space travellers on an a type of ark from a dying sun, they could have had a normal lifespan compared to modern man, but to the world outside and the one they came to, the travel in such a worldlet could allow for such an epic time difference. 3,600 years normal time travelling representing 36 years in near light speed time.