<<Mike Shaw's method sounds too wonderfully simple to be true>>
It is simple, and it does work. <<I would supply paper to which was attached a square or thin strip of reflective 'melinex' or similar plastic>> Excellent idea << How many people necessarilly have a plain mirror (or is that plane mirror) to hand or even know what is meant by the term? >> I think it is a plain, plane mirror. Or perhaps a small, flat mirror <<One point: I assume one has to look for the reflection at 90 degrees to the plain of the paper (this may be a naive point to ask, but I'd just like to be sure)>> Yes, you are finding the time when the sun is perpendicular to the wall. ================================ I have also used Frank Evans' suggestion of finding the time when the sun first (or last) grazes the wall. Ideally, you would mount a board in the sundial spot to avoid wall irregularities, but clients won't do that. I suggested using a window as it (normally) does not have irregularities and is (normally) in the same plane as the wall. Mike Shaw mailto:[EMAIL PROTECTED] http://homepage.ntlworld.com/jmikeshaw/ N 53º 21' 24" W 03º 01' 47" Wirral, UK. -
