Everyone knows that Newgrange is aligned with the winter equinox but did you know that a lesser known cairn in Slieve na Caillaigh (Mountains of the Hag/Witch) in Loughcrew, County Meath, is aligned with the spring and autumn equinoxes and is illuminated by the rising sun on these days.
On the 21st of March, the Spring Equinox, a narrow shaft of light from the rising sun illuminate the backstone of the passage chamber of Cairn T in Carnbane East. Moving from left to right, it highlights engraved sun symbols and rock art. Loughcrew is a neolithic building dating to the late Stone Age.
This illumination and alignment with the equinoxes at Cairn T in Carnbane East was only discovered in 1908 by an Irish American researcher Martin Brennan.
You can find information on the mythological stories and indepth history behind the cairns at Carrowkeel.com
Lovely video on the phenonemon here: