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Article ID: CBB001022009

Studies in Babylonian Lunar Theory: Part III. The Introduction of the Uniform Zodiac (2010)

Britton, John P. (Author)

Archive for History of Exact Sciences
Volume: 64
Pages: 617--663

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Astronomy Moon Constellations; zodiac Ancient Middle and Near East Mesopotamia

This paper is the third of a multi-part examination of the Babylonian mathematical lunar theories known as Systems A and B. Part I (Britton, AHES 61:83--145, 2007) addressed the development of the empirical elements needed to separate the effects of lunar and solar anomaly on the intervals between syzygies, accomplished in the construction of the System A lunar theory early in the fourth century B.C. Part II (Britton, AHES 63:357--431, 2009) examines the accomplishment of this separation by the construction of a successful theory depicting the variations due to lunar anomaly in System A and its subsequent adaptation in System B. The present paper examines the introduction of the uniform zodiac, necessary for any theory depicting variations depending on the position of syzygy. It addresses three questions: (1) In light of all available evidence, what is the magnitude of the constant term in the expression ?? = C - 1.3828Y, describing the difference between the Babylonian sidereal longitudes and modern tropical longitudes? (2) What considerations governed the placement of the Babylonian sidereal zodiac relative to the fixed stars? (3) When was the uniform zodiac introduced? To the first question it finds C = 3.20 <+-> 0.1, scarcely different from Huber's (Centaurus 5:192--208, 1958) estimate of 3.08, essentially confirming Huber's result obtained from much less data. For the second it shows that accommodating the three asterisms comprising Taurus limited the placement of the zodiac to within 3, while the prominence of half sign multiples among the measured intervals between prominent Normal Stars led irresistibly to the choice adopted. Finally, it finds that the zodiac was introduced between -408 and -397 and probably within a very few years of -400.

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Description Continues JournalArticle; John P. Britton; Studies in Babylonian Lunar... (2007) [771461] and JournalArticle; John P. Britton; Studies in Babylonian Lunar... (2009) [932081].

Associated with

Article Britton, John P. (2007) Studies in Babylonian Lunar Theory: Part I. Empirical Elements for Modeling Lunar and Solar Anomalies. Archive for History of Exact Sciences (p. 83). unapi

Article Britton, John P. (2009) Studies in Babylonian Lunar Theory: Part II. Treatments of Lunar Anomaly. Archive for History of Exact Sciences (p. 357). unapi

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