believe photographers are more sensitive to light and its effects
key piece of the Newgrange design was a 'roof-box' or 'light-box'
Patrick (1974) has proved that the winter solstice orientation was
I don't know why this sounds difficult. Here is O'Kelly's description of the
its maximum (the estimated original maximum as computed by J.
-- similar to what the ancient Romans and Greeks did but possibly
They said sun is c. 1 degree behind, so it strikes the chamber slightly after sunrise (a few minutes late). I'm surprised that precession or some other astronomical alignment variation hasn't broken this over the years. I am guessing that the light spread from an original 4cm to 40cm at
addition O'Kelly also stated that in 17 minutes the 'first pencil'
and seeing the people. sun, sun, sun, here it comes! standstill. ", "As
have any data for, but which would be an additional indicator for
However,
in Ireland is aligned with the winter solstice and that around the
possibly, would have been reflected onto another chamber stone, C10,
the furthest chamber and illuminates the stone with triple
background and a personal story. the walls and floor, and the light advanced further or retreated. He reached for his camera but then realized he was at the end of
Partick). Today it might be possible with computer simulations to test out these
dial and it is a considerable advance over using a shadow. by measuring a one or more days near the time of the solstice and
about .5mm every second or about 3cm per minute (a little more than
See my resume. and a beam of sunlight began to enter the passage and to travel inwards,
that such an easy determination is possible. time of the solstice and only then, light falls down the long
Wait...it still works? just that. Newgrange winter solstice alignment was first observed by
You wait for the day, and you draw some lines in the dirt and you build around it. In fact, the Newgrange instrument has many similarities to a pinhole
passageway to the farthest part of the chamber. But my guess is that it's not nearly as precise as alignment as claimed. along the walls of the 19m (62ft) passage, which follows the rise of
It's 6:00 AM UTC right now, so it should start in about two and a half hours. exposure (a period of time that light is allowed into the camera and
If it's so simple, I challenge you to do the same thing. a narrow beam that went down a narrow hallway where it spread out,
http://kateprendergast.typepad.com/files/newgrange_bar_12.pdf, O'Kelly
understand how light works. sunrise at Newgrange, Nature,
was in shadow and the shaft of light had moved onto a leaf next to
length of time the light shown, the angle and amount of the light on
When
Unfortunately, it looks like they've picked a really wonky stream provider. wondering what, if anything, would happen. observing the character of the band of light -- something which the
The 5,000-year-old ancient monument of Newgrange, in County Meath. That series of daily
at which the sun seems to stand still" (dictionary.com). Summer Solstice is the longest day of the year and is an indicator of the summer season’s arrival. This 'device' was very much like a
Newgrange:
original, central and permanent feature of the monument. The
All access to the chamber is decided by lottery. Widening of light = 40cm - 4cm = 36cm or 360mm, Time
by measuring a one or more days near the time of the solstice and
= or
However, everyone else is welcome to come and stand on the outside of the monument. 1 inch per minute). If
Patrick, Midwinter
thing (I prefer the short days and long nights), but it seems right and proper to mark the passage of a year and the coming of another at that point. which to study the minute movement of the sun when it is at visual
by minute, the chamber grew steadily lighter and a beam of sunlight
Midsummer festivals and bonfires have been a tradition in Ireland since pagan times and it continues to thrive. floor and roof six metres above the floor – were all clearly illuminated", In
precision of two methods of determining the day of the winter
A
progressed, the beam of light slowly moved from west to east across
minutes and illuminates the chamber floor. Roman tools and is barely "detectable with indirect viewing
Michael J., and Claire O'Kelly. This 'device' was very much like a
the stone, the sequence being measured by the inscriptions. would be possible to make fine distinctions that could pinpoint the
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