Sirius is the brightest star in the night sky. It has an apparent magnitude of -1.46. In Ancient Egypt, Sirius was known as Sopdet. It marked the flooding of the Nile. The star’s heliacal rising, just before the annual flooding and the summer solstice, played a crucial role in the Egyptian calendar during the Middle Kingdom era. The Egyptians associated Sirius to Isis, the wife of Osiris. Sirius was the most important star of ancient Egyptian astronomy.
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