I just can't seem to get it right. The parentheses were also misplaced. Here are the proper formulas, I hope!
a=asin(sin(T)*cos(Dec)/sin(S)) tan(e/2)=[tan((a+90-Dec)/2)*sin((S-T)/2)]/sin((S+T)/2) Finally, e=2*atan[[tan((a+90-Dec)/2)*sin((S-T)/2)]/sin((S+T)/2)] Bill G.
