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Photographs of our Double Sunset
Dr. Plot and the
Amazing Double Sunset.
In the Autumn of 1998, an amateur astronomer
from Bollington, Kevin Kilburn, investigated the
curious double sunset visible on Midsummer's Day
from the churchyard of Leek's Parish Church,
St.Edward the Confessor. His initial findings were
published as a paper regarding historical astronomy
in the February 1999 edition of Astronomy &
Geophysics, the Journal of the Royal Astronomical
Society. Since then, in January 2000, a Radio 4
interview generated additional public interest and
in May 2001, the double sunset was featured in
'Peak District Magazine' and on BBC Radio Stoke,
Friday, 20 June 2003. The material presented below
was originally three separate articles written
since 1999, but has recently been
updated.
(C) Leekonline
Dr.Plot and the
Double Sunset.
The first and perhaps best account of the double
sunset is found in Dr.Robert Plot's book, 'The
Natural History of Staffordshire', published in
1686. (There is a reprint in Leek Public Library.)
Dr.Plot was the first Keeper of the Ashmolean
Museum and Professor of Chymistry at Oxford. He
described how for a day or two either side of
Midsummer's Day, the sun was observed from the
churchyard to set behind Bosley Cloud and then
reappear in the hollow of the hill's almost
vertical northern side before setting again. Plot
illustrated his comments with a woodcut showing the
hill and the emerging sun. In his illustration the
northern aspect of hill appears much as it does
today, allowing for a little artistic license that
drastically truncates the Cloud on its leftward
side.Another woodcut illustrating the double sunset
appeared in the 'Gentleman's Magazine', in July
1738. In this, perhaps the most famous historical
illustration of the phenomenon, artistic license
runs amok with the hill being shown much too
pointed and the setting sun describing a low
inclination path that in reality is very much
steeper. However, the text accompanying the
illustration is quite valid... "...This hill is so
situated with respect to the Churchyard of Leek,
that a spectator standing there of an evening three
or four days before the 10th of June, beholds the
disk of the sun gradually emerging from beyond the
northward side of the hill, which is nearly
perpendicular..."It is worth noting that 1738 is
before the introduction of the Gregorian calendar
in 1752, which added eleven days to the date of the
summer solstice, now 21st June. Curiously, even the
adoption of the Catholic Gregorian calendar in the
UK is directly attributable to a descendent of a
notable Leek family. Thomas Parker was born in Leek
in 1666 and went on to become Lord Chief Justice of
England, the first Earl of Macclesfield, and then
Lord Chancellor. He financed the building of Leek
Grammar School in 1723. This was shortly before
being found guilty of financial misconduct and his
forced resignation. He later spent some time in the
Tower of London for failing to pay a £30.000
fine! His son, George Parker, the 2nd Earl of
Macclesfield, was an amateur astronomer and a
friend of the Astronomer Royal. George Parker was
largely responsible for pushing through parliament
the 'Bill for regulating the Commencement of the
Year'. This had the effect of not only introducing
the Gregorian calendar to the UK in 1752 but also
of moving the start of the financial year from 26th
March to the present 7thApril.From the church, the
Cloud presents a very distinctive profile but
probably not quite the same as that seen by Dr
Plot, although much closer to his illustration than
that of 1738. Quarrying in the early nineteenth
century certainly demolished a considerable portion
of the northernmost side of the hill including a
tall column known locally as 'Bully Thrumble'. Its
stone was used in the construction of the
Macclesfield Canal and for the aqueduct over the
River Dane. The net effect was probably to 'round
off' the hill contours but the overall profile is
still recognisably that drawn in Plot's book.Of
astronomical significance, from the historical
perspective, Robert Plot proposed using the Leek
sunset to measure changes in the angle of the
Earth's tilt, the obliquity of the ecliptic. This
is presently about 23.5 degrees but varies with a
cyclical period of about 41,000 years and is
currently reducing by about 47 arc-seconds (47/3600
of a degree) per century. However this tiny change
is having a long-term effect. In prehistoric times
the midsummer sun was higher in the sky and set
somewhat northward of its present position and
before about 500BC, in Iron Age times, the double
sunset could be seen twice each year from the
position of the church, firstly as the setting sun
moved northwards along the horizon towards the
summer standstill and then as it reversed. Since
then, because of the reducing tilt angle, the
solstitial sunset has slipped southwards along the
horizon and will continue to do so for thousands of
years. By using a telescope fitted with an eyepiece
micrometer, Plot proposed that measurements of the
amount of the solar disk reappearing in successive
years would allow the long term variation in the
setting point to be measured and hence the change
to the obliquity of the ecliptic to be
quantified.In the late 17th century the double
sunset was relatively easy to see, weather
permitting, from any position eastwards of roughly
midway along the back wall of the churchyard.
Indeed, the small outbuilding on this wall would
have been in an ideal position from where to carry
out the proposed observations. But since then, the
ongoing reduction in the obliquity has caused the
observing point for the reappearance to move
towards the extreme northeastern corner of the
churchyard, the so-called Doctors' Corner.
Nevertheless its elusive reappearance has been
occasionally reported down the centuries to within
the past twenty five years. The last time the
reappearance was seen was in 1977.During the 20th
century the double sunset has rarely been seen,
almost certainly due to inclement weather or local
atmospheric conditions in the line of sight, yet as
recently as 1977 the double sunset, including the
brief reappearance, was still observable from the
churchyard. Simple geometry shows that those
observations of twenty odd years ago could still be
repeated if the observer was to move a scant four
feet eastwards. There is still a bit of room to
maneuver before the vicarage garden wall prevents
further pursuance of the elusive conclusion to this
unique phenomenon.Many visitors go to St.Edward's
on Midsummer's Day to watch for the double sunset
but since the late 1970s trees have obscured the
view. At the summer solstice in 1999, blessed by
good weather and astro-geometrically ideal, a
concerted effort was made to quantify the present
geometry of the double sunset from its classical
observation point, the churchyard of St. Edward's.
Members of the Manchester Astronomical Society,
Macclesfield AS and at least one astronomer from
Jodrell Bank endeavoured to document the famous
sunset. Photographs and video footage were taken
from the churchyard, the church tower and from the
field immediately north of the church. After
several months of analysis, the evidence
collectively confirmed that although the
reappearance was still, theoretically, visible from
the extreme NE corner of the upper churchyard,
trees in the lower cemetery, allegedly planted in
the 1960s to deliberately obscure a 'pagan'
sightline, now prevent the reappearance from being
seen. Nevertheless, it has been possible to fully
justify and quantify Dr Plot's astronomical
predictions.Eventually, within perhaps as little as
twenty five years, the geometry dictates that from
its classical observation ground the sun will not
reappear beyond the Cloud having once set upon the
summit. Sadly the double sunset will then cease to
be visible from the churchyard for well over twenty
thousand years. There is still time to see it,
provided the obscuring tree is trimmed.It has been
pointed out that a double sunset against Bosley
Cloud is visible from elsewhere in Leek. This is to
be expected from any reasonable vantage point along
the solstitial sight-line. But the temporary hiding
of a sunset by a hill or building or tree is
certainly not exceptional. What makes Dr. Plot's
Amazing Double Sunset so unique is that it can (or
could) be seen from such an ancient place of
worship.
(C) Kevin J Kilburn, FRAS.
June 2003
Map
showing viewing point and car parks
The map shows where to park and where to go to see and photograph the
summer solstice double sunset for your photo books.
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The Astronomy of
Leek's Double Sunset
Dr.Plot suggested in 1686 that the double
sunset, or more particularly the partial
reappearance of the sun from behind the northern
end of Bosley Cloud, could be used to measure the
changing obliquity of the ecliptic.
The earth's axial tilt varies between about 24.5
degrees and 22.5 degrees. This is because Earth is
somewhat pear-shape, with the southern hemisphere
being slightly bigger than the northern one.
Gravitational attraction of the sun and planets
results in an uneven pull on the earth's northern
and southern hemispheres and results in a slow
wobble of the rotation axis that takes about 41,000
years to complete a cycle. The Moon's gravitational
attraction tends to dampen out that of the other
solar system bodies and attenuates the changing
obliquity.
The earth is presently tilted at an angle of
23.438 degrees but this has not always been the
case. The angle has been decreasing since
prehistoric times. In 2000BC it was 23.924 degrees
and in AD 6000 it will be about 22.951 degrees.
This changing angle is now fairly well understood
and can be determined as being about 47.7 arc
seconds per century. In Dr.Plot's day it was a
relatively new discovery and quite difficult to
measure.
Changing obliquity must be considered separately
from the generally more familiar 'Precession of the
Equinoxes'. The Platonic Year or Great Year takes
25,800 years to complete a full rotation. It is the
largest of the Earth's 'wobbles' in which each end
of the Earth's spin axis sweeps out a cone, exactly
like a spinning gyroscope or toy top. Axis
precession is quite noticeable and has been known
since classical times. Precession rotates the
direction of the earth's axis with respect to the
stars and changes the seasons by changing the
apparent position of the Vernal Equinox, when the
sun moves from the southern celestial hemisphere to
the north, now on or around 21st March.
Seen against the background of zodiacal stars,
the sun's position at the Vernal equinox moves
steadily in reducing Right Ascension at a rate of
502.9 arc seconds per century. This also slowly
changes the dates of the solstices and equinoxes.
The summer solstice, when the sun is highest in the
noonday sky, is now on 21st June but in AD1500 it
was a day later, 22nd June and in AD2500 it will be
a day earlier, 20th June. This effect accumulates
as one goes further back or forward in time.
Precession also determines the position of the
'pole star'. For practical purposes, this is the
star that happens to be closest to the projected
northern end of the rotation axis, the North
Celestial Pole, around which all the others appear
to rotate during the course of an evening. Nowadays
it is the brightish star, alpha Ursae Minoris, more
commonly known as Polaris. Mariners have used
Polaris for estimating North for many centuries
because it can be seen from anywhere north of the
earth's equator.
Polaris is presently very close to the NCP and
is a reliable indicator of North. A thousand years
ago, Polaris was six degrees away from true north
and five thousand years ago, it was nowhere near
the NCP. The star, Thuban, in the constellation of
Draco, was the northern pole star during the Bronze
Age, ca 2100BC, at the time of the Egyptian
Dynasties. Thirteen thousand years from now the
Pole Star will be the bright, blue-white star,
Vega. There is currently no bright pole star in the
southern hemisphere.
In 1675, just six years before Dr. Plot visited
Leek, Charles II founded the Royal Observatory at
Greenwich. This was in the age when Britain ruled
the waves and long voyages of exploration and trade
were commonplace to the Americas, to the Orient and
to the Pacific. Accurate celestial navigation was
of supreme British national importance and could
certainly be regarded as the 17th century
equivalent of the modern strategically important
American GPS (global positioning system) used to
target cruise missiles! The Rev.d John Flamsteed,
the 28 year old son of a Derby brewer, from the
village of Denby, near Belper, became the Royal
Observatory's first director and the first
Astronomer Royal. He was charged with the task of
accurately measuring the position of the naked-eye
stars so that they could be used for navigation. A
by-product of this research was to refine and more
accurately quantify both precession and changes to
the Earth's obliquity.
Flamsteed and Dr.Plot were both Fellows of the
Royal Society (Plot became its Secretary in 1682)
and they almost certainly knew one another. Robert
Plot clearly knew his astronomy and was pretty much
up to date with a broad spectrum of contemporary
science. He was also a trained surveyor and was
aware that if an experiment was set up in the
churchyard to annually measure the setting sun
cutting the edge of the hill... "the sun's greatest
northern declination (which astronomers say is less
now than heretofore) may be gradually adjusted, and
at length perhaps limited".
Consider his reasoning. The most direct way of
measuring the angle of the earth's axial tilt is to
measure the maximum height of the sun in the noon
sky at the solstice. But there are practical
difficulties. It is only possible to measure the
sun's position with respect to a known datum and at
Greenwich this was with respect to the horizon or
celestial pole using a graduated metal arc equipped
with telescopic sights and capable of being swung
vertically on the side of a masonry pier fixed in
the plane of the meridian and accurately set up
using plumb bobs and distant horizon markers. By
1689, Flamsteed's latest and greatest 7-foot mural
arc (paid for out of his own pocket, when he
inherited money at the time of his father's death)
could be read to less than a second of arc,
1/3600th of a degree. But there was another other
difficulty, the sun is a large object, half a
degree in diameter and blindingly bright. It is
very difficult to see where its edge lies for
measurement purposes and for Flamsteed to work to
the accuracy needed it was nigh on impossible.
However, Robert Plot proposed that from the Leek
churchyard, a trained observer could measure the
maximum northerly setting point of the sun, using
the near-vertical north face of the Cloud as a
datum line, with a suitable instrument equipped
with an eyepiece micrometer to measure the
projecting portion of the solar disk beyond the
hill. He would be observing the edge of the sun
whose brilliance was dimmed by passage through
thicker layers of the atmosphere. As over the years
the reduction of obliquity would cause the setting
point to regress southwards, it would eventually
allow calculation of the change to the tilt. Of
course Plot also understood that so close to the
horizon atmospheric refraction would have to be
taken into account. So would air pressure but it is
not known if he was aware of this important
effect.
As far as is known, Robert Plot's idea to
measure the changing obliquity from the churchyard
at Leek was never carried out. In all likelihood,
the weather dependent solstitial reappearance of
the sun was simply too hit and miss. He was right
in one thing though, it would have taken many years
of painstaking observation, bedevilled by bad
weather (the English climate was particularly rainy
in the late 17th century), to even begin to gain
meaningful results.
But in order to attempt to quantify the
phenomenon at Leek, let's examine the geometry of
the reappearance in more detail. The northern
aspect of the hill is not vertical, it is largely
concave and a line drawn across this hollow closely
parallels the setting sun angle. By definition, to
reappear, the sun must first disappear and then
reappear within this concavity. The depth of this
concavity dictates the time span during which the
disappearance-reappearance phenomenon can be
observed from any fixed observation point.
Think of it another way: if the solstitial
sunset could be 'frozen' just as the sun's disk was
reappearing an observer at the churchyard could, by
moving along a line drawn diagonally across the
churchyard 'control' what he saw. If the sun was
just reappearing, by moving NE the observer would
see a larger and larger portion of the disk
revealed from the concavity until a point was
reached where the sun's edge would not have
actually disappeared on setting. Conversely, if he
moved SW the sun's disk would be increasingly
hidden from view until it was no longer seen to
reappear. This applies constraints and defines an
observing 'window' in which the double sunset
phenomenon, disappearance and then partial
reappearance, is possible.
The depth of the hill's concavity is about 6 arc
minutes (360 arc seconds) and the obliquity is
reducing by 47.7 arc seconds per century at right
angles to it. So the double sunset lasts for about
750 years from any fixed place in the churchyard
[360/47.7]. At 10.5km from the hill, this
observing 'window', from the NE leading edge to the
SW trailing edge, is about 35 meters (110ft) wide
and owing to the changing obliquity of the ecliptic
it has scanned slowly north-eastwards across the
churchyard since the Iron Age.
About two thousand years ago, the midsummer
sunset cast for the first time the double-edged
shadow of the Cloud upon what is now the southwest
corner of the churchyard. A thousand years ago, the
shadow fell on the newly built church itself. In Dr
Plot's day, three hundred years ago, the shadow had
moved northeastwards due to the changing obliquity
of the ecliptic that he wanted to measure, and by
the end of the second millennium the trailing edge
had reached the extreme northeastern corner of the
churchyard. Only from the Doctor's Corner is the
reappearance still, theoretically, just visible.
Yet to duplicate the geometry of 1975, an observer
in AD2001 has to step only 0.8m (2ft6in)
north-eastwards, at right angles to the line of
sight.
Negative observations can often be as important
as positive ones. At least the 1999 solstice gave
an opportunity to record the present geometry from
several places in and around the site. Although not
definitive, it has allowed a better understanding
of the phenomenon and has opened up opportunities
for further study.
One interesting observation was made in June
2000. The setting sun was sinking behind distant
clouds level with the top of the hill. In high
power binoculars (20x60), an aircraft contrail (but
not the aircraft) was seen near the sun at the same
elevation. It then was realized that considering
that aircraft typically cruise at some 30-35,000
feet, the sun would be obscured by any cloud lower
than this, a realistic cloud ceiling. Subsequent
calculations showed that at the elevation of Bosely
Cloud, ¾ degree as seen from Leek church, it
was necessary for there to be clear sky below
35,000 feet along a line-of-sight roughly 200 miles
long. That is, no cloud between Leek and a point
roughly between The Isle of Man and Stranraer. This
could explain why the double sunset was so rarely
seen during the 19th and 20th centuries when air
pollution from the Lancashire mill towns could
easily have affected visibility of the sunset.
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Archaeoastronomy
The church dates to the early 14th century but
there are references to a building in pre-Norman
times that was destroyed by fire in 1297. Although
there is no direct evidence in the form of
artifacts, because the immediate area has never
been excavated, the hilltop on which St. Edward the
Confessor stands may have been a place of worship
for five thousand years. This argument may be
strengthened by the name of an old house nearby,
called Foxlowe. The place name, 'low', a hill, is
commonly used in the moorlands and is often
associated with prehistoric sites set on
hilltops.
The precision of St.Edward's solstitial
alignment to the Cloud is better than the famous
midsummer sunrise alignment above the Heel Stone at
Stonehenge on the same day of the year. It also
matches the deliberate orientation, towards the
midsummer sunset, of Arbor Low, the "Stonehenge of
the North", nine miles south of Buxton. Judging
from the orientation of many Neolithic tombs and
early Bronze Age monuments, our prehistoric
ancestors had a basic appreciation of the cycles of
the sun and moon that was apparently associated
with their religious beliefs. In particular, the
period between about 3200BC and 2500BC saw the
construction of monuments within so-called 'sacred
landscapes' in which astronomical alignments often
featured. The location of the church may indicate
one such site from where in prehistoric times, the
sun set directly behind the tip of the distinctive
silhouette of the hill.
In 1862, John Sleigh, in his book, 'History of
the Ancient Parish of Leek, in Staffordshire',
recorded that an ancient burial mound, six yards
high and forty yards in diameter, was excavated on
what is now the Westwood estate. On 29th December
1851, cremated human bones were found together with
pieces of a burial urn. Fragments of the urn are
still kept at Leek's Nicholson Institute, in a room
above the Public Library. More work needs to be
done, but it has been suggested that this part of
town was once occupied by a Neolithic or Bronze Age
settlement of which Cock Low was its last remaining
evidence, flattened a hundred years ago by urban
development. Cock Low is long gone but was at the
eastern end of the playground in Spring Gardens.
From there the double sunset was never visible, but
in the early Bronze Age, the midsummer sun did set
above a shallow depression on the Cloud, the
Bridestones 'notch', in which sits an even older
megalithic long barrow.
Since June 2001, discoveries of other solstitial
alignments further support the idea of
archeo-astronomical activity in the area.
Overlooked four years ago was the fact that
extending a line from Cock Low through the
Bridestones, roughly intersects the village of
Marton, on the A34 northwest of Congleton. The idea
of 'ley-lines' connecting places of archeological
interest is nearly a century old but has no
recognised archaeological basis. Nevertheless, the
Leek-Bridestones-Marton line can be drawn and was
worth investigating.
From the churchyard of St. James & St. Paul,
Marton, the mid-winter sun now rises over Bosley
Cloud on 21st December. More particularly, it can
be calculated that from the site of that beautiful
half-timbered14th century church, standing on a low
mound of uncertain origin, the winter solstitial
sunrise ca 2500BC was over the very obvious 'notch'
in the Cloud in which the Bridestones
lie.
In recent e-mail communication from Dr. Jill
Collens, Archaeological Officer at the Cheshire
County Sites and Monuments Record office (CSMR),
two Bronze Age finds have been identified within
2km of Marton but there are dozens of other sites
and finds within a10km radius of Bridestones. This,
together with the Cock Low alignment, strongly
supports the idea of Bridestones being the focus of
early Bronze Age solstitial solar alignments.
Further evidence was forthcoming later in the
autumn of 2001 when it was pointed out that the
prominent hill, Mow Cop, also thought to be a
prehistoric site (although no evidence to support
this), is visible from Bridestones. More
particularly, calculations showed that on
mid-winter's day the sun would set on or very close
to the summit of the hill when viewed from the
stone circle or forecourt of the Bridestones
monument. This demanded further investigation as it
had been of some puzzlement as to why the
Bridestones are sited where they are, facing
westwards below the summit of the saddle between
the Cloud and Long Edge and yet placed awkwardly on
rising ground on the north side of the dip.
3D computer maps, capable of being rotated in
different directions, were constructed of the area
around Bridestones and Mow Cop and used to study
the landscape geometry. Together with basic
trigonometry and planetarium software to allow
calculation of prehistoric sunset points, and
assuming that visibility of the winter sunset was
important to the prehistoric builders, the
positioning of Bridestones now makes sense and fits
into a broader archaeoastronomical
context.
On mid-winter's day the sun does indeed set on
Mow Cop as seen from the Bridestones forecourt.
About five thousand years ago, when Bridestones was
constructed, the sunset point was about two solar
diameters left of the present point and closer to
the summit of the hill. But the siting of the
monument is more refined, as any visitor to the
site can now appreciate. Leaving your car on Dial
Lane and walking northwards along the driveway of
Bridestones Farm towards the gate to Bridestones,
Mow Cop comes into view when only halfway along the
driveway. Before then, Mow Cop and the solstitial
sunset is hidden by the nearby hill to the south.
This imposes a constraining NE-SW sightline on the
landscape southeast of which Mow Cop cannot be
seen. A similar constraining sightline, running
SE-NW and perhaps not so tight, extends towards the
summer solstitial sunset. This is more difficult to
calculate nowadays because of the high trees
immediately N of the monument blocking the view. In
the 18th century these trees were not present and
in Neolithic times could also have been cut back.
Archaeological evidence elsewhere suggests that
localised deforestation was practiced and from
Bridestones trees on more distant horizons would
have had a negligible effect on solar
alignments.
Bridestones certainly commands a good view of
the Cheshire plain and the midwinter sunset on Mow
Cop. It is argued that the summer solstice was also
important to the Neolithic builders but
complications would have arisen if the monument had
been placed further north on rising ground towards
the Cloud (or lower down the slope, westwards from
where the midwinter alignment would have been
lost). On the midsummer azimuth, nearly a degree
further north in 3000BC than at present, a
projecting ridge running SW from the summit of the
Cloud and overlooking Timbersbrook would have
blocked the view of the midsummer sunset. The Mow
Cop alignment is again affected. Yet sited just
where they are, Bridestones gave their builders an
unobstructed view of both solstitial sunsets and
all sunsets in between, throughout the year.
Archaeoastronomy is still a contentious subject
and it is difficult to prove that astronomical
alignments were deliberate, yet this is apparently
what we see regarding those at Bridestones. It
should be made clear that the monument was not a
prehistoric 'observatory' but simply a ritualistic
burial site incorporating astronomical alignments.
There is another site, a late Neolithic stone
circle at Brickbank Farm, Henbury near
Macclesfield, which also had a winter solstitial
sunrise alignment against Sutton Common. This was
pointed out nearly thirty years ago by a local
archaeologist, Gorgon Rowley.
There remains one question, why? It is likely
that a small hunter-farming community ca 3000BC
constructed Bridstones overlooking the Cheshire
plain to serve as a resting place for their dead
and perhaps to mark a boundary of their territory.
It may also have been located away from their main
habitation as a special place of ritual to which
they processed at certain times of the year. One
thing is certain: At a time when the total
population of Cheshire was probably no more than
5000 people and considering that a cairn
allegedly100m long,10m wide and perhaps 3-4m high
contained thousands of tonnes of stones quarried
nearby on the Cloud, very many man-hours went into
its building. It was a very important place.
Elsewhere in Britain and Ireland there is growing
evidence to suggest that the setting sun was
significant in prehistoric burial rites and may
have represented the end of life with the prospect
of re-birth. We simply don't know for sure. In
Ireland, at Nowlth and at Newgrange, and in Orkney
at Maeshowe, the sun was the focus of interest in
prehistoric times predating Bridestones by nearly a
thousand years. Here on the Cheshire-Staffordshire
border, Bridestones also appears to have been
deliberately positioned to view the sunsets from
midwinter to midsummer and back again and was also
aligned very precisely towards the equinoctial
sunset. However, without the builders bisecting the
angle between the solstitial sunsets (which they
may have been able to do) this very accurate E-W
orientation may be a chance alignment.
Bridestones was probably in active use for
hundreds of years in the late Neolithic and was
apparently still used as a sightline to the winter
solstitial sunrise from Marton and the summer
solstitial sunset from Cock Low well into the
Bronze age. By then, society had changed from a
community-centred culture to an hierarchical one in
which group burials were superceded by single
burials of important individuals, in circular
burial mounds. We know that such a mound existed at
Cock Low in Leek, and we may yet find that Marton
church is located on another.
Much more work needs to be done but the
Bridestones legacy, the sunset phenomenon from the
site of St. Edwards, Leek, may have been of
secondary importance until well into the Christian
era and latterly into recent historical times when,
for its curiosity value and post-renaissance
scientific interest, the double sunset has taken
priority.
Kevin J Kilburn, FRAS. January
2002.
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Arbor Low, plan of stones.
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Arbor Low, solstitial sunset.
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The Bridestones.

Marton Sunrise 2002
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Bridestones winter sunset 2001
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Alignment map
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(C) Kevin J Kilburn, FRAS.
January 2002
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Photographs of our Double Sunset
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