Babylonian Ziqpu Stars: Precursor to Equatorial Mapping via 30-Day Intervals — E8 Intelligence Research

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Babylonian astronomy's use of ziqpu stars and star catalogs organized by 30-day intervals to track time via meridian transits served as a foundational precursor to systematic equatorial mapping. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Andrew Stewart Caldin

doi:10.5281/zenodo.22155079

August 29, 2026Open Access

Babylonian Ziqpu Stars: Precursor to Equatorial Mapping via 30-Day Intervals — E8 Intelligence Research

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Key Points

To evaluate how Babylonian ziqpu star transits and 30-day star catalog intervals functioned as early foundations for systematic equatorial and right-ascension celestial mapping.
Analyzed Babylonian astronomical records documenting culmination and meridian transits of ziqpu stars.
Evaluated the geometric and arithmetic properties of the base-60 sexagesimal system and its division into 30-day (30-degree) intervals across a 360-degree circle.
Demonstrated that ziqpu star transits established sidereal day timekeeping at 15 degrees per hour (360 degrees per 24 hours), serving as an early analog to right ascension.
Found that 30-day intervals corresponded to 1/12 harmonic divisions of the 360-degree circle, facilitated by the fractional factors of the base-60 sexagesimal system.
Identified that Kidinnu's solar year calculation of approximately 365.25 days maintained an absolute error of less than 0.001 days without reliance on golden-ratio proportions.

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Implication

Historical analysis reveals 30-day ziqpu star meridian transits structured early equatorial mapping in Babylonian astronomy, indicating an early geometric-arithmetic foundation for celestial...

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Andrew Stewart Caldin (2026) studied this question.

synapsesocial.com/papers/6a93f1396c1a8fb52e79dfef https://doi.org/10.5281/zenodo.22155079

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Babylonian Ziqpu Stars: Precursor to Equatorial Mapping via 30-Day Intervals — E8 Intelligence Research

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Babylonian Ziqpu Stars: Precursor to Equatorial Mapping via 30-Day Intervals — E8 Intelligence Research

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Cite This Study

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