N-body evidence that a metre-per-second fragment separation from Halley's Comet could reach Earth's orbit in AD 529–531 — and what it cannot yet prove.
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**Last updated:** July 09, 2026
**Scientific analysis based on the primary source:** Mildner, S. (2026). *Geodynamic Reinterpretation Model for Ptolemy's Germania Magna: General Model Description, Cartometric Foundations*, (v9.0). EarthArXiv (Preprint). [https://doi.org/10.31223/X5KB51](https://doi.org/10.31223/X5KB51) ([📥 **Download NEW-v9.0-PDF**](https://zenodo.org/records/20758648/files/Geodynamic_Model_Description_for_Ptolemys_Germania_Magna___eartharxiv__c9.0.pdf?download=1))
A Multi-Revolution Fragment Channel from Halley’s Comet to Earth’s Orbit around AD 530:
([📥 **Download NEW-v10/Halley-PREVIEW**](https://zenodo.org/records/21270073/files/halley_multirev_fragment_channel.pdf?download=1))
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***Disclaimer***
*This article reports an exploratory orbital-mechanics experiment from the v10 development layer of the Germania Magna project. It concerns a side thread — whether cometary fragments could in principle have reached Earth's orbital neighbourhood around AD 530 — and is deliberately separated from the geodynamic model itself, whose trigger hypothesis (the Saale-Unstrut fragment impact) does not depend on any particular provenance of the impactor. The earlier negative results of this project remain in force and are restated below. Nothing in this article claims that a Halley fragment struck Earth; the analysis quantifies a possibility channel, states its dominant systematic openly, and derives testable predictions. The analysis has not been evaluated by peer review.*
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