RJ, I think my posts are out of sync with your question!
About the Dhow shadow in the GE image, that is some other day some other time. I was just amazed at how clear it is from the satellite view.
For the D&M shot the Sun has to be coming from the west (end of day) and actually a little bit north of west. That would throw the Dhow's shadow over D&M. At 5 pm the Sun was 13 degrees north of true west and 27 degrees above the horizon.
This is where I get my sun angles from: Sun Earth Moon Applet
The rest is figuring out where the picture was taken and just estimating the angles. Banzai found some program that helps to do this but I have never craked it open. It would swallow me up I'm afraid. So I just estimate as best I can. Sometimes I will throw in a Cosine correction (that's the effect where you can make an angle bigger or smaller when you view it obliquely).