BTW, apropos of nothing in particular: here’s another app I’m liking a lot at the moment. This is Azimuth Sunrise/Sunset, a daylight clock with a ton of extra features. The cloud swirls aren’t invented: they’re live weather data. The nightside imagery comes from NASA’s BlueMarble project. This thing has a ton of controls I’m only starting to get to grips with.
The app’s over here: https://itunes.apple.com/gb/app/azimuth-sunrise-sunset/id417438455?mt=8 …Not free, but not incredibly expensive either… I believe I paid Euro 1.79 for it.