Thursday, 16 January 2014
When the 45 degrees is subtracted from the NBL line it can be seen to be close to the light blue roseline, both extended as far as Markinch(!) on the outer circumference, and both, plus the Bass Rock line minus 45degrees all cross over Arthurs Seat area, a spread of some two degrees. Bill allows some three degrees for a 'Selah' spoke,
The grid unit I used in this excercise is one-half of the full 27.7+mile and can be seen to derive naturally from the internal construct of squares and circles. This unit was originally chosen so I could work on maps back when Google Earth was not available, and was more suitable to the area of geometry I was concentrating on.
The (3 by 1) diagonal the 'reshel' sytem was based is shown in yellow at the bottom and the ninety degree axis from the mid-point of the base is shown in green running nor nor west. The two (2by1) diagonals to the extremities of the (3by1) set of squares is fron the centre St Mary's chapel are also shown in green.
The Great Pyramid construct with Hillend Fort at the apex is shown in dark blue. The equilateral triangle lines with apex just short of Inchcolm island are shown in mauve. The centre of the pentagonal system used in this excercise is defined by two red lines between these two sets. (Same as the grid! I should have changed the colour! TG) This pentagonal system is constructed on the full (3by1) baseline, which is a comparitively recent addition to the system as notified by Bill a while back. The original used a shorter base and the pentagonal system using that baseline reached Loch Leven in Fife, but was not included in this excercise, but was discussed back in a 2007/8 post when I was just using Ordnance Survey grid references and doing the calculations with a calculator. Neither pentagonal system is shown here, omitted to allow a clearer view of the grid structure.
This grid has intrigued me since first discovered back in 1999/2000 and re-inforced after the Bornholm work in 2003/4.
How far this grid extends is uncertain, but extensions to Ben Lawers for example and other connections hint that it may extend beoynd the area shown here. Line of sight points, moutain tops especially, could be used as surveying trig points, and used more locally as centres of construction but that is for an other time!
Also, this grid system is merely one layer of what is altogether too complex (for me, at any rate!), there is still a large backlog of stuff to cover. My hope was to find that this grid would lead to a simplification of the whole plan, but it hasn't as yet!