LOL .Thanks Moss dunno how I missed that .Yep looks like Mynnd Cilciffeth would be in the way .Might that be be prominent ?.It's not that it's an "alignment " as such , unless of course the monumnet is oriented towards it , but from Carreg Samson to Myndd C it's very close to to equinox sunrise but if the horizon is just genearlly hilly it's even less salient .
Some information, no ones been on TMA to Cerrig Lladron, love to go back and do a week there - on horseback for getting around...
Coflein "Remains of a stone row, situated within open moorland on a level terrace below Cerrig Lladron. The three stones are aligned from NNE to SSW, the row measuring 17m in length overall. The row is aligned with the large round cairn on the summit of Cerrig Lladron (PE298), which is about 200m to the SSW. The largest stone measures 2.5m in height, 1.9m in length and 1m in width. Its nearest neighbour, that to the NNE, measures 0.4m in height, while the stone situated to the SSW measures 0.7m in height. A further upright stone is situated immediately to the NE of the largest. It measures 0.6m in height and may have been displaced from the row."
I checked the heights with trig and C.L. Just scrapes it .
It would be good to see a pic of the "stone row " .