The Sun shines into the chamber at two times during the year which happen to coincide with the so called Celtic 'cross-quarter' days which are really not Neolithic in context.This helps to predict new moons days before they align to the cairn.
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The following pictures show some of the incised artwork on the inner facing othostats
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The rayed designs here could indicate stars or star like planets that may have traversed across the passageway. Altair, a 0.8 magnitude star in Aquila, the eagle, transits the passageway from approx. 2000BC - 500BC.Elnath, a 1.7 mag. star in Auriga, the charioteer, crosses from 4100BC - 3500BC. Of course some of the planets would also show up framed in the passage, notably Saturn for a whole year in 3319BC.
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The cairn sits up on a grassy knoll
Cairn H , from Phase Two of the complex, is decidedly different in plan to the 6 chambered cairn 'eye'. Having a central azimuth of 112.5° Its plan is classically cruciform in shape. (see fig. above).At the entrance to the right side recess there is a sill stone beautifully carved with 3 concentric multiple rings and larger multiple rings in the left recess incised on a slab of granite.
Note the fact that these are not spirals like at Newgrange but appear to be related just the same.
Larger rings overlap each other here on this recess stone.
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Notable stars that would have crossed the passageway back in the fourth and fifth millennia were the red-orange giant Betelgeuse, in Orion, between 4100BC and 3700BC; and its sister star Bellatrix between 3500BC and 3000BC.
