I have had an app on my iPhone for several months now that I thought was pretty cool. It gave me several photography related tools. But I recently went into it to find out a sunrise time and it gave me completely wrong information. Circular File!
I also realized that the only function I really wanted was sunset/sunrise information. So I found a new application, VelaClock. For $4 it doesn’t do anything but give you clock information. I especially like the twilight times and azimuths. I find the list of locations limited but hope that will improve.