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Zodiacal Light: From Holy Light to False Dawn

Bulletin of the American Astronomical Society (233 Meeting Seattle)

Zodiacal Light: From Holy Light to False Dawn George Latura A s the voice spoke, all at once, a shaft of holy light bound together heaven and earth with its radiance.’ (Euripides, Bakkhai, trans. Mueller, 2005, p. 216). In Euripides’ play (c. 405 BCE), Dionysus manifests a ‘holy light.’ Pindar links Dionysus to ‘the holy light at summer’s end,’ which is best explained as the zodiacal light that is most visible at the equinox. Although Cassini is credited with the scientific discovery of the zodiacal light in Western Europe (c. 1680), this ethereal light along the ecliptic had purportedly been known in ancient times by Egyptians, Phoenicians, and others (Gandz, 1943). The Egyptians worshipped the god Sopt, or Sopdu, ‘Lord of the East,’ as the embodiment of the zodiacal light. Sopt‘s name was written with an upward-pointing triangle, the shape of the zodiacal light (Gandz, 1939). The use of the zodiacal light in the Egyptian solar cult was also proposed in a report in the ARCE Journal (Gary, Talcott, 2006), where it was seen as the herald of Ra returning from the underworld. A recent paper hypothesized that the zodiacal light might have been the astronomical component of the Mysteries of Eleusis that were celebrated near Athens for a thousand years (Latura, 2018). The Lesser Mysteries were held in the spring, while the Greater Mysteries took place in autumn (Milonas, 1961). The zodiacal light appears most prominently at the opposite equinoctial seasons (Kelley, Milone, 2005), which suggests cultic connections that were kept secret through oaths of silence (Latura, 2014). In Arabia, the zodiacal light was known at least since the time of Mohammed (c. 600 CE). Muslim tradition (hadith) refers to the zodiacal light as the ‘false dawn’ or ‘tail of the wolf’ due to its vertical shape, as opposed to the true dawn that appears horizontally. This information is important because, during the month of Ramadan, Muslims must fast during the day, but may eat at night. Knowledge of the zodiacal light was necessary so that the faithful would know the correct time when eating stops and prayer begins: at the true dawn. What cultural forces might have shaped the journey of the zodiacal light from the holy light of Egyptians and Greeks to the false dawn of Islam? Zodiacal light rises from the eastern horizon along the ecliptic to envelop Saturn, Venus and waning crescent Moon, on Oct. 7, 2007, at Skinakas Observatory, Crete. Photo courtesy Dr. Stefan Binnewies.