The Llananno Megalithic
S1, Llananno to Dick's Seat tumuli group,
High precision Megalithic calendar alignment indicating the rising point of the Sun on two megalithic calendar intermediate dates- CIs 2.5 7.5 which occur in the Gregorian calendar @25th April @18th August. The exact declination of this point is +13° 13.2'.
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S1 to Dick's Seat OS.
The arrangement here, though clearly astronomical does not lend itself to the best observational practice. The tumuli do not break the horizon as the ridge of Kerry Forest behind is several metres higher.
Also the surrounding hills, though more prominent, do not carry tumuli groups. This appears to be because their tops do not coincide with bearings for one or other megalithic calendar division points.
Detailed examination of the Ordnance Survey shows the care the builders took in relating the summit of Rhiw Port with the required astronomy.