>Perhaps a precise solution would be to calculate the intersection of the
>hour line with the enclosing frame of your sundial. It must be done by a
>computer but its easy to give a very good precision.
>
>The result would be given as a length and a direction (north, east, south,
>west side of the sundial), the origin could be one of the two opposite
>corners.
>
>The only problem then is to precisely draw your frame, with parallel sides
>and a good perpendicularity.
>
>With one intersection point you can draw the line by joining it to the
>gnomon foot.
>
>I plan to include such kind of data in my Shadows program in a futur
>version.
Bonjour Francois and everyone else:
Your frame method for plotting would be a good practical way to implement
John Pickard's (x,y) coordinate method. With a squared frame around the
sundial work area, one could use it as a reference to easily measure the
horizontal and vertical distances to the x,y coordinates.
Let us know when you get your new shadows program up and running. Do you
think I'd understand it or would I have to get someone to help me?
merci Francois,
John Carmichael
