Newgrange is a Neolithic monument in Ireland’s Boyne Valley, County Meath. It was constructed around 3,200 BC, which makes it older than Stonehenge and the Pyramids of Giza. Newgrange is a large circular mound 85m (279ft) in diameter and 13m (43ft) high with a 19m (63ft) stone passageway and chambers inside. The mound is ringed by 97 large kerbstones, some of which are engraved with megalithic art.
Newgrange was built by a farming community that prospered on the rich lands of the Boyne Valley. Nearby are Knowth and Dowth which are similar mounds that together with Newgrange have been designated a World Heritage Site by UNESCO(a).
Both Robert Hensey(f), who has studied and written about Newgrange [1766.6] and Mike Parker Pearson, Stonehenge’s leading authority, have endorsed the idea of a French origin for megalith building(g).
Newgrange is best known for the illumination of its passage and chamber by the winter solstice sun. Above the entrance to the passage at Newgrange, there is an opening called a roof-box. This baffling orifice held a great surprise for those who unearthed it. Its purpose is to allow sunlight to penetrate the chamber on the shortest days of the year, around December 21st, the winter solstice.
Like all ancient monuments, the Boyne Valley cluster has generated its collection of wild speculation, such as Freddy Silva’s claim that there is a connection between Knowth and Sacsayhuaman near Cuzco in Peru and who also hints at a possible link with Egypt’s Osirion(b)!
The unaccredited Keystone University in Ireland published a video in 2020 in which it claimed that “the neolithic tomb at Newgrange in the Boyne Valley is, in fact, the famed temple of Atlantis and one of the oldest temples on earth as a result(i).” This daft claim is a development of Ulf Erlingsson‘s theories published in 2004.
The winter solstice event is not the only astronomical link proposed for Newgrange. Anthony Murphy and Richard Moore have written(c) about the Cygnus Constellation and a possible link with Newgrange . Paul Dunbavin also touched on the possible connection between swans in Irish mythology and astronomical events(d).
Even more unlikely is the suggestion from E. A. James Swagger in The Newgrange Sirius Mystery  in which the author endeavoured to link Ireland’s most important megalithic site with both an early understanding of precession and the symbology of the Dogon.
Furthermore, the imaginative Frank Joseph has speculated that “the early date for Newgrange, its circular construction, sophisticated solar orientation and mythic tradition all point to Atlantean origins.” [0636.70]