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This report presents a summary account of two surveys undertaken by the authors to determine and interpret the alignments of the western and eastern passage tombs at Knowth, Co. Meath. The findings indicate that contrary to earlier suggestions, the eastern passage and the western passage (inner and outer) are not aligned towards sunrise and sunset respectively at the period of the vernal and autumnal equinoxes.
Prendergast, Frank, and Tom Ray. (2017). "Alignment of the Western and Eastern Passage Tombs." In Excavations at Knowth 6: The Passage Tomb Archaeology of the Great Mound at Knowth (Appendix 2), edited by George Eogan and Kerri Cleary (Archaeological Editor), 263–276. Dublin: Royal Irish Academy.