Do you think it is sometimes possible to tell a sunrise from a sunset in a picture without obvious clues like the exact location where it was taken? Link in comments, my Android SoH app still won't work right.
Did you try an iPhone?
Did you try Un-installing the app and reinstalling after a reboot of your phone? There's also a new official version on Google play if you haven't updated yet either.
The colors of a sunrise is completely different than a sunset. Well I can tell the difference at least.
Near water, there is often mist during a sunrise that isn't there by sunset.
That is just a shoot from the hip answer.
Is it weird that this is a topic that I've often thought about?
Not really, what is weird to me is that there are internet sites actually covering this, I thought it's only me who thinks you can tell the difference.
Interesting, my first thought was sunrise when I saw the picture. It would be interesting to test more pictures.
Inspired by an artwork I recently saw, sorry not online. The deep ruddyness immediately made me think sunset. I think it's possible and would like a test with a few dozen images but have found none so far.