Sirius its constellation, Canis Major (Greater Dog). The heliacal rising of Sirius marked the flooding of the Nile in Ancient Egypt and the "dog days" of summer for the ancient Greeks, while to the Polynesians in the Southern Hemisphere the star marked winter and was an important reference for their navigation around the Pacific Ocean. The brightest star in the night sky, Sirius is recorded in the earliest astronomical records. Its displacement from the ecliptic causes this heliacal rising to be remarkably regular compared to other stars, with a period of almost exactly 365.25 days holding it constant relative to the
The Sirius Mystery argue that the only way that the Dogon could have obtained what he understood to be accurate information on Sirius B was by contact with an advanced civilization; he considered alternative possibilities, such as a very ancient, advanced, and lost civilization that was behind the sudden appearance of advanced civilization in both Egypt and Sumeria. He personally found the theory of alien contact more convincing, but he did not claim certainty about it. Noah Brosch explained in his book "Sirius Matters" that cultural transfer could have taken place between 19th century French astronomers and Dogon tribe members during the observations