Hi Roger, I am looking forward to hearing your presentation and meeting you at the NASS meeting. I think Fer has pointed out the need for the negative 1 in your first equation. I have not seen before the sunrise angle psi of:
>> Sunrise Path: Cos psi = Sin l / Cos D I assume l is L for latitude and psi is the angle with the horizon. Interesting. I have been pondering some thoughts this summer about planes and some way to show on a dial map WHERE the sun is setting by a shadow. I like the opening screen of the NASS home page that shows the area of daylight on the planet -- but that is the computer screen -- I like "real" maps. Has this been done on a dial? Fred Sawyer showed in the Compendium the method Foster used to map TIME around the world. Any ideas on this from anyone? Happy dialing, Warren Thom (Lat=41.649N Long=88.096W) - Chicago
