Ancient Astronomical Alignments: Fact or Fiction? - Frank Prendergast, Technological University Dublin
Archaelology Ireland, Vol.16, no.2, 60, Summer 2002, pp.32-35.
https://arrow.tudublin.ie/arastart/2/
or
https://arrow.tudublin.ie/cgi/viewcontent.cgi?article=1002&context=arastart
or
http://www.jstor.org/stable/20562589
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