Ancient Egyptians, Nile flooding, and the Rhind Papyrus river scribes
From the Rhind Papyrus we know that river scribes monitored this most important aspect of their kingdom. They would read the river's depth gauges and report the water level. Astronomer-priests keep calendars to prepare citizens for the helical rising of that Dog Star Sirius. This was the moment when Sirius's position to Earth was far enough away from the Sun so that it could be seen again. When it was seen, it "barked its warning" that THIS was the last day of preparation for dyke repair and canal dredging. This remarkable correspondence led Egyptians to compare the stars action to that of the animal who, by his barking, gives notice of danger. He called this star the dog, the barker, Sirius. - Rico Roho