Castleruddery : Stone Pair

Grid RefS 917 945
Longitude6° 38' 3.05" W
Latitude52° 59' 36.31" N
ITM east480366
ITM north584435
Nearest TownDonard (3.5 Km)
OS Sheet55
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 11th December 2005

I am not 100% sure about these two stones, but there are several things about them that could indicate some antiquity. Firstly, why haven't they been moved? They are sat right in a natural gateway between two fields, so you would think someone would have moved them. Secondly they are set in such a way that their alignment points at a good V-shape in the mountains on the southwest horizon.

They are also at one end of a 70m long, 5m wide, 3m deep trench, which apparently is a medieaval fish pond, but I'm not so sure about that. It's very odd that someone would build such a pond so that it is on a direct line between Castleruddery stone circle and the nearby cairn by coincidence. Even if it was later used as a fish pond, could it be the remnants of a cursus?

The two stones are both 1.5m tall andegg-shaped with the pointy end upmost.

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About Coordinates Displayed

This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.

Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.

Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.

The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.

UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.

ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.

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