Horizon:

When shooting scenic shots, you need to decide where to place the horizon. Use the Rule of Thirds to make the decision process easier. Now you have three basic choices: upper third, middle third and lower third.

Upper Third:

The upper third is used to highlight the ground and any items on the land.

Middle Third:

The middle third is the least used, because it is boring and static. Use it if you want to convey equal importance between the sky and ground.

Lower Third:

The horizon is set on the lower third when you want to show off or highlight the sky. This would be the placement to use if you are filming a sunset or cloud pattern.