The term Night Skies refers to the sky as seen at night.
The term is usually associated with astronomy, with reference to views of celestial bodies such as stars, the Moon, and planets that become visible on a clear night after the Sun has set.
Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing.
The Aurora Borealis and Aurora Australis light up the skies of the arctic and antarctic circle respectively.
Occasionally, a large Coronal Mass Ejection from the sun or simply high levels of solar wind extend the phenomenon toward the equator The night sky and studies of it have a historical place in both ancient and modern cultures. In the past, for instance, farmers have used the state of the night sky as a calendar to determine when to plant crops.
Many cultures have drawn constellations between stars in the sky, using them in association with legends and mythology about their deities.
The anciently developed belief of astrology is generally based on the belief that relationships between heavenly bodies influence or convey information about events on Earth.
The scientific study of the night sky and bodies observed within it, meanwhile, takes place in the science of astronomy.
The visibility of celestial objects in the night sky is affected by light pollution.
The presence of the Moon in the night sky has historically hindered astronomical observation by increasing the amount of ambient lighting.
With the advent of artificial light sources, however, light pollution has been a growing problem for viewing the night sky.
Special filters and modifications to light fixtures can help to alleviate this problem, but for the best seeing both professional and amateur optical astronomers seek viewing sites located far from major urban areas.
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