archaeology
Archaeology or archeology is the study of human activity through the recovery and analysis of material culture. The archaeological record consists of Artifact (archaeology), artifacts, architecture, biofact (archaeology), biofacts or ecofacts, ...
, a roofbox is a term for a specially contrived opening above a doorway, that is constructed in such way that at particular times of the year e.g. the winter or summer solstices, the Sun would be directly in view from the chamber or passage within.
The term was coined by Professor Michael O’Kelly during his excavation of the
Newgrange
Newgrange () is a prehistoric monument in County Meath in Ireland, placed on a rise overlooking the River Boyne, west of the town of Drogheda. It is an exceptionally grand passage tomb built during the Neolithic Period, around 3100 BC, makin ...
passage cairn, at
Brú Na Bóinne
(, "mansion or palace of the Boyne"), also called the Boyne Valley tombs, is an ancient monument complex and ritual landscape in County Meath, Republic of Ireland, Ireland, located in a bend of the River Boyne. It is one of the world's most im ...
, Ireland.
The roofbox was built directly above the entrance door to the passage. The passage and chamber were specifically aligned with the rising sun of the mornings around the winter solstice in December. The 17 metre passage rises in elevation as it leads to the chamber.
The chamber floor, the roofbox and the local horizon are on a single plane and so as the sun's morning rays penetrate the roofbox, they illuminate the chamber floor for a maximum of 17 minutes (weather depending).
A roofbox is also found in Cairn G of the
Carrowkeel Megalithic Cemetery
Carrowkeel is a cluster of passage tombs in south County Sligo, Ireland. They were built in the 4th millennium BC, during the Neolithic era. The monuments are on the Bricklieve Hills (''An Bricshliabh'', 'the speckled hills'), overlooking Lo ...
.
References
O'Kelly, M. J., 1983, Newgrange: Archaeology, Art and Legend, Thames & Hudson
Archaeological features