During his research into neolithic art, passage tombs and astronomy, Martin Brennan noted that its passage was orientated so that the cross quater days sunrise (half way between the solstice and the equinoxes) shines onto the rear stone at the back of the chamber. Due to bad weather conditions on the cross quater days in 2005 and 2006 it was not possible to witness this but some two weeks later I was able to observe the impressive alignment still functioning. A clear sunrise on the 15th Febrary 2006 gave an impressive display when just before 8am the backstone of the passage was brightly lit by sunlight as you can see in the photos below. This general view of the mound was also taken at this time.

During his research into neolithic art, passage tombs and astronomy, Martin Brennan noted that its passage was orientated so that the cross quater days sunrise (half way between the solstice and the equinoxes) shines onto the rear stone at the back of the chamber. Due to bad weather conditions on the cross quater days in 2005 and 2006 it was not possible to witness this but some two weeks later I was able to observe the impressive alignment still functioning. A clear sunrise on the 15th Febrary 2006 gave an impressive display when just before 8am the backstone of the passage was brightly lit by sunlight as you can see in the photos below. This general view of the mound was also taken at this time.