Knowth passage-grave in Ireland: An instrument of precision astronomy?

Knowth, a Neolithic passage-grave at the UNESCO World Heritage Site Brú na Bóinne, functions as a precision astronomical instrument, facilitating the harmonization of solar and lunar cycles. Unlike Newgrange's well-documented winter solstice alignment, Knowth features two internal passages aligned to equinoctial directions but not precisely oriented to them. Rock art on kerbstone K52 suggests depictions of astronomical cycles, supporting the hypothesis that Knowth served as a calendar and counting system, enabling calculated planning and structuring ritual life. The study combines new surveys with existing evidence, arguing for Knowth's role in Neolithic cosmological beliefs and astronomical precision.

Prendergast, K. (2017). Knowth passage-grave in Ireland: An instrument of precision astronomy? Journal of Lithic Studies, 4(4), 67–76. https://doi.org/10.2218/jls.v4i4.1921