Sunset on canvas, poster, wallpaper and ArtFrame by Rossum-Fotografie

The sun has only fully set when the entire solar disk is no longer visible, so that the daytime duration is on average slightly longer than the night; the night only starts when the sun is completely down and ends when the first bit of sun is visible. Due to reflection in the atmosphere, it remains light for some time, so sunset is not equal to the moment when it gets dark.