Sunset or sundown is the daily disappearance of the Sun below the horizon in the west as a result of Earth’s rotation.
The time of sunset is defined in astronomy as the moment when the trailing edge of the Sun’s disk disappears below the horizon in the west. The ray path of light from the setting Sun is highly distorted near the horizon because of atmospheric refraction, making the sunset appear to occur when the Sun’s disk is already about one diameter below the horizon.
We all love to take sunrise-sunset shots. In fact, chances are good that when you got your first digital camera it wasn’t long before you tried it out on a sunrise-sunset. Everyone has sunrise-sunset images with glowing colors.