Sunset is close of the day. Sunset is the point at which the Sun is first completely below the horizon marking the start of twilight. It should not be confused with dusk, which occurs at the end of twilight. Sunset colours are usually more dazzling than sunrise colours, because the evening air contains more elements than morning air.
Sunset will happens when sun is between 12 and 18 degrees below the horizon and slowly degrades over a period of 30 minutes before night time officially begins. Sunset will begin from running faded of dark blue through the skyline at first, and this slowly turns to black as night time begins.
Nature has so many spectacular things to show us as long as we have an open eye for it. Sunset is witness of the amazing spectacle of light and rich colours fill the sky.