Abstract English In Western astrology, the claim that “horoscopes identify individuals” or “houses identify individuals” circulates widely. This paper reexamines this claim through structural verification based on astronomical calculation. Comparing charts for three consecutive years (1982–1984) with the same date/time (July 5, 1983,15:42 JST) and same location (Matsudo City, Chiba Prefecture) but differing only in year, the results showed that the Sun’s zodiac sign and house were completely identical across all three years. Extended verification across all 10 planets confirmed that all planets except the Moon share identical values for all persons born at the same date, time, and location under geocentric calculation, and that even the Moon is dependent on birth time and shared by multiple persons born within a similar time window.Structural analysis demonstrates that none of the 10 planets in a horoscope possesses an information structure capable of identifying an individual on a one-to-one basis. The experience of “identifying” someone derives from misattribution to external information (name, date of birth, consultation context) brought by the client. Furthermore, this paper explains why the question (Question ①: “Does identification information exist?”) was never tested in 40 years of prior research from Carlson (1985) to ClearerThinking (2023) — as a structural blind spot resulting from concentration on testing the derivative proposition (Question ②: “Can astrologers identify individuals?”), leaving the premise unverified. Preliminary confirmation establishes that an isomorphic structural conclusion holds for Four Pillars of Destiny as well.
Shiga Takashi (Fri,) studied this question.
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