Hello Brook, to calculate the exact values of the position of the Sun in sky, you may use the program SUN_EPH that has been attached to Compendium June 2003, Email version.
The values that I have obtained are the same of those of Fritz Stumpges (with differences of few arc second) To calculate the angles of the mirror (declination and inclination) are needed : two observations , the knowledge of the distance between the mirror and the ceiling and the coordinates of the two light spot, in a system with the origin in the point where the vertical through the center of the mirror touch the ceiling. In the group of programs REFLSUN, attached to the number of March 2004 of Compendium, there is a program written just to do this kind of calculation. It usefull when we dont know haw the mirror is and if the mirror has had a displacement during its fixing. If you want I can send the two programs attached to Email messages (900 kbs and 2100 kbs). Best Gianni Ferrari 44° 39' N 10° 55' E Mailto : [EMAIL PROTECTED] -
