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Mosley's Zodiac (year 1988 CE) This table depicts the "true" dates of the signs, as calculated in 1988 by astronomer John Mosley, of Griffith Observatory in Los Angeles, using observational astronomy coupled with the "boundaries" of the constellations as established by the International Astronomical Union in 1928. Since the IAU boundaries of the constellations are relatively arbitrary, compared to when the first stars of a sign actually rise heliacally, some see this table as inherrently flawed, even though Mosley has re-inserted Ophiuchus (though his placement of her after Scorpio is questionable).
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