Hi Alexei, I have built a "lightweight laser trigon" from a laser pointer and some scraps of perspex. As well as producing hour lines and declination lines on arbritrary surfaces, the trigon also has an attachment that allows it to project analemmas about any hour line.
I have written up the instrument, and am expecting the article to appear in the next (October) issue of the British Sundial Society Bulletin. I supplied some pictures of the instrument to Bob Terwilliger, which he said he may add to his own version on his web pages: http//www.shadow.net/~bobt/trigon/trigon.htm Regards, John Davis
