If you are getting ready to film a sunset you have to make sure that you are in correct position, not just to see the sun but the other objects that you want to include along with the sunset. These can be things like the coastline, the skyline of a city, or a mountain top. The sunset may highlight this, shadow it in darkness, or otherwise prepare the correct framing for this. You may want to check out this area of the sunset ahead of time so that you have a general idea of what you want and can have in the image.