Sunrise Sunset on the Map (com.kokufu.android.apps.sunrisesunset) on Google Play
This easy and convenient app will allow you to find out which direction the sun rises or sets on the Google Map. If you want to take a picture of the Tokyo Tower with the setting sun, you can use this app to figure out when is the perfect date and time to do so. Just find the Tokyo Tower on the map, and make sure you're in the correct time zone. The line indicated on the map will show you which direction the sun sets, so move the seek bar at the bottom to see when the line and the Tokyo Tower overlaps or is the closest. The date and time displayed is your answer.