See what's waiting in the wings and vote for what you would like to see next. The problem is to calculate the time and location of sunrise and sunset for any location on earth as well as the sun's location for any date and time. The plaque will be an outline of the mountain peaks from visible from the computer room with sunset positions and dates marked.
Astronomers have several coordinate systems and several time measurement systems to choose from.
Useful for them I suppose, but complicated for the beginner. After working for several days on a comprehensive TAstronomy component, I scaled back to the current effort. Latitude, longitude, azimuth and altitude are the only user interface concepts required. I fixed an error or two, and changed several equations to more accurate versions found in other programs and texts. The current version seems to match pretty well with all the calibration points I've tried - if you find any significant errors, please let me know.