The ancient Egyptian New Year began when the spectacularly brilliant star Sopdet (Sothis in Greek; Sirius in Latin) was seen to rise before the sun in the early morning. This is known as the heliacal rising of the star. During part of the year, you see, Sirius is so close to the sun that the greater solar light blots out the light of the star and the star seems to disappear from the sky. The heliacal rising is the day that the sun and Sirius are once more far enough apart that—for the first time in months—Sirius may be once again seen in the pre-dawn skies. From at least the time of the Pyramid Texts, the beautiful star Sopdet was associated with the beautiful Goddess Isis. Sirius is the holy star of Isis and you can look for Her heliacal rising sometime this month. […]
Source: When does Sirius, the Star of Isis, rise in your area?