The Sirius lore
Assem Deif is writer is a professor of mathematics at Cairo University and Misr University for Science and Technology. This is a brief excerpt from an article on the star Sirius and its significance to ancient Egyptians and other cultures.
When the star (Sirius) begins to flicker low on the horizon (before sunrise) it marks the beginning of a New Year in Ancient Egypt. The Egyptians referred to the heliacal rising and its associated festival as prt spdt, “the going forth of Sepdet”. The star hid for 70 days, and now it has returned from the duat (underworld) to bring welfare to the land and to allow its people to bury their dead.
The 70 days of the star’s invisibility is due to the dominance of sunlight in this period. When it starts its heliacal rise from the east it is ahead of the sun by about 11 degrees, moving across the celestial sphere to set in the west. On subsequent nights, it distances itself from the sun by appearing earlier and spending longer in the night sky until it eventually becomes out of phase with the sun, rising just when the sun is setting over the western horizon. It again approaches the sun on successive nights until it disappears totally from view, obscured by the sun’s brilliance for 70 days before reappearing again for a few minutes just before sunrise — the heliacal rising.
Not only does the star herald the flooding of the Nile, but the shade of the blue-white star is also important. If the star appears bright and clear, the Egyptians expect an abundant harvest. If it is dull and reddish, a poor harvest results. In the second century AD the Egyptian astronomer Ptolemy described the star as being red, and the less red it was the better the harvest.
The Arabs too revered the star, which they called “Al-Shi’ra Al-Yamaniyyah”, referring to Yemen, south of Mecca; for it was this star which guided them in this direction. Many nations paid homage to its goddess, Isis. Her fame spread to all corners of the Roman Empire, and the last recorded festival of Isis took place in Rome in 394 AD. There was even a temple of Isis on the River Thames in London. To the Egyptians she was the caring mother and the symbol of fertility. She also owned magical powers; as she restored her husband to life after he was murdered by his brother Set. Some scholars believe the River Nile took its name, Siris, from Sirius. Not only was it the foundation of the Egyptian religious system, but its celestial movement determined the Egyptian calendar.
The hieroglyph of Sirius is a red triangle with a small ben-ben and a five- pointed star near it.
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