The illumination of the passage and chamber at the Winter
solstice sunrise in Newgrange is world famous. Less well known is the
Equinox illumination at sunrise in Cairn T at Loughcrew. The backstone of the chamber is illuminated by
a beam of light at sunrise on the Spring and Autumnal Equinoxes.
The sun light is shaped by the stones of the entrance and passage and descends the backstone while moving
from left to the right illuminating the solar symbols.
