rockhopper wrote:
As I stated previously, the stone is very clear indeed from 2.5 kilometres. It ceases to be visible from around 4 kms away. If it was moved 25 metres, it would not mark the moment of the "true" equinox, which it currently does with pinpoint accuracy. I'll pass on your comments to Mr Power. I'm sure he'll find them most informative.
The change in azimuth when you move an object 25 m from a distance of 2.km is less than a degree much less than the accepted level of accuracy , it may even make it more accurate . Pinpoint is not to be expected , it also depends on whether you measure from first gleam or full sun which differs by a degree and a half . Has it nver been explained to Mr Power why the alignmment may not have been recognised ? 