sun·set 
/ˈsʌnˌsɛt/ noun
plural sun·sets /ˈsʌnˌsɛt/ noun 1 [noncount] : the time when the sun goes below the horizon in the evening
▪ We arrived just before sunset. [=(chiefly US) sundown] ▪ Prayers begin at sunset. ▪ We worked from sunrise to sunset. 2 : the colors that are in the sky when the sun slowly goes below the horizon [count] ▪ a beautiful sunset [noncount] ▪ the golden light of sunset
▪ We arrived just before sunset. [=(chiefly US) sundown] ▪ Prayers begin at sunset. ▪ We worked from sunrise to sunset.
