Night

Night or nighttime is the period of time between the sunset and the sunrise when the Sun is below the horizon. This occurs after dusk. The opposite of night is day (or "daytime" to distinguish it from "day" as used for a 24-hour period). The start and end points of time of a night vary based on factors such as season, latitude, longitude and timezone.

At any given time, one side of the planet Earth is bathed in light from the Sun (the daytime) and the other side of the Earth is in the shadow caused by the Earth blocking the light of the sun. This shadow is what we call the darkness of night. Natural illumination is still provided by a combination of moonlight, planetary light, starlight, diffuse zodiacal light, gegenschein, and airglow. In some circumstances, bioluminescence, aurorae and lightning can provide some illumination. The glow provided by artificial illumination is sometimes referred to as light pollution because it can interfere with observational astronomy and ecosystems.

Read more about Night:  Duration and Geography, On Other Celestial Bodies, Impact On Life

Famous quotes containing the word night:

    The victors and the vanquished then the storm it tossed and tore,
    As hard they strove, those worn-out men, upon that surly shore;
    Dead Nelson and his half-dead crew, his foes from near and far,
    Were rolled together on the deep that night at Trafalgar!
    Thomas Hardy (1840–1928)

    It is not night when I do see your face,
    Therefore I think I am not in the night;
    Nor doth this wood lack worlds of company,
    For you, in my respect, are all the world.
    William Shakespeare (1564–1616)

    The night knows nothing of the chants of night.
    It is what it is as I am what I am:
    And in perceiving this I best perceive myself
    And you.
    Wallace Stevens (1879–1955)