The Dog-star; so called by the Greeks from the adjective seirios, hot and scorching The Romans called it canicula; and the Egyptians, sothis
The brightest star in the night sky, Sirius was the embodiment of Isis, sister and consort of the god Osiris, who appeared in the sky as Orion Sirius first appeared in the dawn sky each year around the time of the summer solstice and just before the Nile's flood season Egyptians believed Sirius was responsible for the rains, so it was vital to accurately predict its arrival Sirius was the centerpiece of Egypt's 365-day solar calendar, and its appearance marked the beginning of the new year