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 town is silent. The night boils with eleven stars.
    Oh starry starry night! This is how
    I want to die.
    Anne Sexton (1928–1974)

    Now night perfumes lie upon the air,
    As rests the blossom on the loaded bough;
    And each deep-drawn breath is redolent
    Of all the folded flowers’ mingled scent
    That rises in confused rapture now.
    Philip Larkin (1922–1986)

    I would introduce myself if it were not useless. The name I had last night will not be the same as the name I have tonight. For the moment, then, let me say that I am thinking of Sam Slovoda.
    Norman Mailer (b. 1923)