The Llananno Megalithic
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S1 and S2 Llananno central backsights for
the Llananno Megalithic Complex.
Sites S1 and S2, Brondre Fawr, Llananno.Along two kilometres of Brondre Fawr ridge there are, or have been, a linear string of stone blocks. Some 10 are under examination for their potential as astronomical backsights
With extensive photographically verified calculation it is clear that the two stone blocks S1 & S2 are centrally positioned to support two astronomical formalities: (1) a Major lunar standstill observatory and (2) many divisions in the 16 epoch Megalithic Calendar
Of the 25 tumuli and cairns visible to the unaided eye from this place 19 support high resolution solar or lunar alignments from S1 and S2.
S1, Llananno, Brondre Fawr.This carved rock cut seat faces east toward the concentration of tumuli supporting megalithic calendar alignments.
The surrounding stone ring has only a few remaining stones.
A ruined cairn lies at 30 metres distance to the south south- east.
S2 Llannano.Weighing in excess of 2 tonnes this earthfast block is carved to an armchair or throne shape. When sitting squarely an observer's eye is directed to the largest Bronze Age cemetery in Wales strung along the crest of the prominent hill known locally as y Glog, Dolfor.
See S2 to y Glog.
S2 to y Glog anchor alignmentFrom photographic extrapolation we see how the ancient astronomers capitalised on the fortuitously angled western hill flank of y Glog. This slope averages the precise curving path of the moonrise at the Northern Major Standstill allowing a mobile observer much extra time to adjust the spark of the lunar upper limb in the notches between tumuli and establish accurate stake settings.
Obliquity hill slopesThe angles of rise/set of both Sun and Moon throughout their cycles averages the Angle of Oblquity to the Ecliptic- the angle between the plane of the Earth's equator and the plane of it's orbit. There are many examples throughout Britain of the management of hill slopes which match obliquity for high resolution foresights
See Ballochroy to Bien a Cora, Isle of Jura, Argyll......Four Stones, Walton to Evenjob Hill, Radnorshire.....Thornborough Great tumulus to Castle Bank. Yorkshire.
Parallax relationship between S1 and S2Once the alignment S2/ y Glog/ northern lunar extreme had been established the position of S1 would be determined at a distance to the north giving exacly the stance for one lunar diameter difference from stone S2 on y Glog.
From simultaneous photographic studies the declination difference on y Glog between stances S1 and S2 has been found to be exactly one mean lunar diameter... 31.1 arc minutes. A probable function for this would be the estimation of lunar parallax by gauging the condition of current Apparent Diameter of the Moon.
Method for estimating current lunar parallax at, or near, a lunation.Two observers #1 at S1 and #2 at S2 standby near a lunar extreme to observe the full moon rise.
Observer #2 will 'catch' the first flash of the upper limb and,- by moving lateraly,- 'bring' the flash into a notch or onto a tumulus and set a stake at that point.
Observer #1, a few minutes later, will then 'bring' the lower limb of the Moon down onto the same foresight and set a stake when perfectly aligned.
When the two stakes have been set their relationship to the fixed markers S1 and S2 can render the sign of current parallax and the magnitude.
If the stakes are outside S1 to S2 then parallax is negative...the Moon apears smaller than average.
If the stakes are within S1 and S2 then parallax is positive...the Moon appears larger than average.
Also the magnitude of the current parallax may be estimated by measuring the distance of the stake positions from the stone markers S1 and S2...In good weather conditions these should be equal.
This data would be essential for the subsequent calculations to be employed around the standstill necessary to locate the exact day of the ultimate extreme.....