S1, Llananno to Rhosgrug I twin tumuli,
Crown Estates, Llananno.
High precision alignment
from S1 carved stone block at the centre of Brondre Fawr ridge stone circle to Rhoscrug I a&b, twin tumuli, indicating the exact centre of the Sun when rising on Megalithic Calendar
intermediate intervals nos. 10.5 and 15.5.- which occur in the Gregorian calendar @ 15th February and again @ 27th October.
Rhoscrug I a&b Bronze Age Twin Tumuli, Crown Estates, Lanbister.
Rhoscrug I a&b, Llanbister.
One of the high hills on the Crown Estates, Llananno. A typical Mid Wales moel-a round-topped symmetrical hill. Several of the highest tops on these Crown properties are adorned with one or more earthen tumuli. The bed stone of this area is friable Silurian/Ordovician mud-stone and very little rock is exposed as even the highest hills have a covering of boulder clay. The only available materials for mound building is this clay and turf stripped from the nearby hill-side.
Survey of images from 15th February 2002.
Direct extrapolation from the layered images secured may trace the Sun's path back to the horizon.
The ideal required declination for CIs 10.5 and 15.5 of -12° 39.6' was attained at 10:00 hrs...2.5 hours later.
Here we see that the path straddles the tumuli in close agreement with several photographic studies in other years.