Which goddess was the personification of the star Sirius and the new year? Sopdet was the answer. Ancient Egyptians used her celestial identity to connect Sirius with the annual rhythm of the Nile and the calendar.
Sirius’s heliacal rising—its first visible appearance just before sunrise after a period hidden by daylight—roughly preceded the Nile’s yearly inundation in early Egyptian history. That made the star an important marker of renewal, fertility, and the beginning of a new agricultural cycle. Sopdet was the goddess formed from this astronomical observation.
Her Greek name was Sothis, and she was associated with Wep Renpet, the Egyptian New Year. Sopdet was also linked with Sah, the constellation Orion, and their mythic child Sopdu, a god connected with the eastern sky. Later traditions increasingly identified Sopdet with Isis, so Isis can appear in related religious or astronomical contexts—but Sopdet remains the specific canonical answer to this clue.