Aries 8° is in fact a legitimate Babylonian norming point for the vernal equinox in a zodiac in which degrees are not counted from the vernal point, but from sidereally fixed zodiacal signs beginning with Aries “The Hired Man” in the Babylonian zodiac. The norm 8 Aries as the vernal point underlies many Hellenistic astrological texts and continued in use throughout late antiquity....'' - Rochberg, F. (2010). In the path of the moon: Babylonian celestial divination and its legacy (Vol. 6). Brill.
''Not only is the Babylonian origin of the zodiac assured on the basis of cuneiform documentation but, as Neugebauer has demonstrated from the deviation (≈5°) between modern longitudes and those given in Greek horoscopes, the astrological literature of the hellenistic and Roman period continued to use the norming point of the Babylonian zodiac (Aries 8° or 10°). - ibid.
This most useful method of comparing ancient and modern data was suggested to me by J.P. Britton. Babylonian (sidereal) longitudes may accordingly be compared against modern computed (tropical) longitudes by means of a correction factor which takes into account the constant of precession and the date of the data to be compared. Therefore, λ Babylonian = λ tropical + ∆λ, where ∆λ = 3.08° + 1.3825° × year date number. 3.08° is the correction factor for the year 0 and 1.3825° is the constant of precession per 100 years. - ibid. somebody at the time could not have used Lahiri or Raman
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