Showing posts with label Misc. Show all posts
Showing posts with label Misc. Show all posts

Friday, 29 March 2013

The other Stonehenge Solstice connection


In a world around which the Universe rotates, the Sun moves its plane (circle) up and down along the polar axis. In summer, the plane is high over England, so the days are long. The sun’s circle rises from the north east and sets in the north west. In winter, the plane is low, so the sun’s circle rises from the south east and sets in the south west:


If you are not familiar with the idea of a solar plane, a post here explains it in more detail.  A lot more detail on the sun’s apparent movement can be found on this wikipedia page (which describes the ecliptic).

Monday, 25 March 2013

Stonehenge's alignment to Solstice

 
The alignment 
It's well known that Stonehenge is aligned to the Solstices. At Britain's latitude, the winter solstice sunset is only just over two degrees different from the opposing direction at summer solstice. At Stonehenge, the hills to the north east make the sun appear just that little bit later, which means that the two events are even closer than you would find on a flat plain. 

A posteriori evidence 
There is evidence from places such as Newgrange that the solstices may have been important to some Neolithic people. Sunrise at winter solstice produces a beam of light which shines down the Newgrange passage.


However, Newgrange is a long way from Stonehenge. It was constructed hundreds of years earlier. It also looks nothing like Stonehenge. Stonehenge does not appear to do anything special with the beams of sunlight, so the best we can say is that Newgrange (and similar monuments which are known to have a solstice function) might provide a fairly weak (a posteriori) link if the monuments are of the same type.