This is a short post that shows the difference 15 minutes can make to the light on a scene. These two photos were taken at Cellito beach on the North coast of NSW (near Forster). One before sunset and the other about 15 minutes later. The mood in each photo is completely different despite this short period of time.
This is a perfect example of how the light changes quickly during sunrise and sunset. If you are not ready you can miss the best light of the day. For this reason it pays to get to the location at least half an hour before sunset to allow time to find the right composition and setup your gear.