Sky

upright=1.25|thumb|The night sky over Slovenia in July upright=1.25|thumb|cirrus cloud|Cirriform clouds and a quarter [[Moon in the blue daytime sky over Germany]]

thumb|Bird flight by a [[brown pelican.]] thumb|Human-engineered flight: a United Airlines [[Boeing 787 taking off from Heathrow Airport in December 2013.]]

application of science and technology to predict the conditions of the atmosphere for a given location and time

meteorological optical phenomena

dark sky in the deep twilight or at night

shadow that the Earth casts on its own atmosphere

Extraterrestrial view of outer space

visual perception of the sky and how it scatters and diffuses light.