Around 8.45pm, 6 days after the summer solstice 2019, sun streams into the passage through the ‘roofbox’ at Cairn G. Sunlight also penetrates into the chamber between the passage door lintel (the bottom of the ‘roofbox’) and the blocking stone.
Summer sunset shining through the light box into the rear of the chamber, just before 10pm on the 2nd July 2005. Because the passage is so short Cairn G is not nearly as accurate as Newgrange or even Loughcrew Cairn T which have longer passages. This means a good sunset two or three weeks before or after the Summer Solstice will be quite similar to the main event.