Knowth passage-grave in Ireland: An instrument of precision astronomy?
Knowth is one of three large monuments at the Neolithic complex in the bend of the River Boyne in County Meath, Ireland. The others are Newgrange and Dowth. All three have obvious solar alignments but whereas the alignment to the winter solstice sunrise at Newgrange has been extensively researched and interpreted, little has been attempted regarding the way that astronomy functions at Knowth and Dowth. This paper treats the evidence for solar and lunar alignments at Knowth.
Knowth has two internal passages with entrances at the east and west. The paper draws on new surveys as well as interpretations of the evidence at Knowth that includes rock art engraved on kerbstones around the circumference. Particular engravings on kerbstone K52 are interpreted as depicting astronomical cycles. It is argued that, while Knowth’s passages function in relation to the equinoxes, they are not internally orientated to match exactly the equinoctial directions. Rather, it seems that they may have been constructed and used to facilitate the harmonisation of the solar and lunar cycles - much in the same way as does the equinoctial Judeo-Christian festival of Easter. The paper concludes by suggesting that like Newgrange, Knowth may be an astronomical instrument that enabled its builders and users to construct accurate calendars and counting systems, which in turn facilitated calculated planning and was a fundamental structuring principle for their ritual lives and cosmological beliefs.
Eogan, G. 1986, Knowth and the Passage Tombs of Ireland. Thames and Hudson, London, 147 p.
Grogan, E. 1991, Appendix: radiocarbon dates from Brugh na Boinne. In: Eogan, G. (Ed.), Prehistoric and early historic change in Brugh na Boinne. Proceedings of the Royal Irish Academy, 91(C): p. 126-127. Retrieved 21 November 2016. URL: https://www.jstor.org/stable/25516079
Hensey, R. 2015, First Light: The Origins of Newgrange. Oxbow, Oxford, 200 p.
MacBain, G. 2006, Finding Easter at Knowth. Irquas Insight, (3). Retrieved 11 November 2016. URL: http://homepage.eircom.net/~archaeology/three/knowth.htm
Mackie, E.W. 2009, The Prehistoric Solar Calendar: An Out of Fashion Idea Revisited with New Evidence. Time and Mind, 2(1): 9-46. URL: http://www.tandfonline.com/doi/pdf/10.2752/175169709X374263
Mackie, E.W. 2013, A Rosetta Stone for the Prehistoric Solar Calendar? Kerbstone K15 at Knowth, Ireland. Time and Mind, 6(2): 211-229. doi:10.2752/175169713x13589680081894
Meaden, G.T. 1991, The Goddess of the Stones: The Language of the Megaliths. Souvenir Press, London, 224 p.
Meaden, G.T. 2017, Drombeg Stone Circle, S.W. Ireland: Design plan analyzed with respect to sunrises and lithic shadow-casting for the eight traditional agricultural festival dates - with photographic confirmation. Journal of Lithic Studies, 4(x): current issue
Moroney, A.M. 1999, Winter Sunsets at Dowth. Archaeology Ireland, 13: 29-31.
Murphy, A., & Moore, R. 2006, Island of the Setting Sun. In Search of Ireland’s Ancient Astronomers. The Liffey Press, Dublin, 340 p.
O’ Brien, T. 1988, Winter solstice and decoration at Newgrange. Riocht Na Midhe, 8(2): 50-59.
O' Kelly, M. 1982, Newgrange. Thames and Hudson, London, 232 p.
Patrick, J. 1974, Midwinter Sunrise at Newgrange. Nature, 249: 517-519. doi:10.1038/249517a0
Prendergast, K. 2004, Caves of the winter sun. Synthesising the evidence for astronomical orientation at the Boyne valley passage tombs. Riocht Na Midhe, 15: 12-25.
Prendergast, K. 2012, The Neolithic Monument of Newgrange in Ireland: A Cosmic Womb? In: Archaeology of Mother Earth Sites and Sanctuaries through the Ages: Rethinking symbols and images, art and artefacts from history and prehistory (Meaden, G.T. Ed.), Archaeopress, Oxford: p. 57-64.
Prendergast, F., & Ray, T. 2015, ‘Alignment of the western and eastern passage tombs at Knowth Tomb 1’, Appendix 2. In: Excavations at Knowth 6: The Great Mound at Knowth (Tomb 1) and its passage tomb archaeology (Eogan, G., & Cleary, K., Eds.), Royal Irish Academy, Dublin: p. 1-17. URL: http://arrow.dit.ie/arastbk/3/
Ruggles, C.L.N. 1997, Whose Equinox? Journal of the History of Astronomy, 28: 44-50. doi:10.1177/002182869702802205
Ruggles, C.L.N. 1999, Astronomy in Prehistoric Britain and Ireland. Yale University Press, London, 285 p.
Ruggles, C.L.N. 2005, Ancient Astronomy: An Encyclopaedia of Cosmologies and Myth. Santa Barbara, ABC-CLIO, 518 p.
Sakrajda, P. 2005, Eastern Passage, Knowth, County Meath, Ireland. Wikimedia Commons. Retrieved: 11 November 2016. URL: https://commons.wikimedia.org/wiki/File:Knowth.jpg
Smyth, J. (Ed.) 2009, Brú na Bóinne World Heritage Site Research Framework. The Heritage Council, Dublin, 151 p. URL: http://www.worldheritageireland.ie/fileadmin/user_upload/documents/BrunaBoinneWHSResearchFramework.pdf
Van Hock, M.A.M. 1987, The Prehistoric Rock Art of County Donegal (Part I). Ulster Journal of Archaeology, 50: 23-46. URL: https://www.jstor.org/stable/20567997
Van Hock, M.A.M. 1988, The Prehistoric Rock Art of County Donegal (Part II). Ulster Journal of Archaeology, 51: 21-47. URL: https://www.jstor.org/stable/20568110
Wun, C.B. 2008, The Gods’ Machines: From Stonehenge to Crop Circles. Frog Books, Berkeley, 528 p.
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