SunCalc is a super-simple web app created with Google Maps and Javascript that helps you determine the best time to shoot depending on the quality of light you want in your photos.
http://www.petapixel.com/2011/01/28/suncalc-provides-a-map-view-for-checking-sunlight-and-golden-hour/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed:+PetaPixel+(PetaPixel)
Have you ever wanted to create beautiful night photos but it was completely dark when you found the right spot and subject? Well the bluehoursite.com web site will help you by calculating the best time frame for taking stunning blue hour pictures. If you don't know what is "blue hour" then you're in the right place. It refers to the time after the sun goes below the horizon and the sky goes into deep blue for a while. This is the best timing to take photos.
http://www.bluehoursite.com
It takes just two seconds.