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:
“Victorious men of earth, no more
Proclaim how wide your empires are;
Though you bind in every shore
And your triumphs reach as far
As night or day,
Yet you, proud monarchs, must obey
And mingle with forgotten ashes, when
Death calls ye to the crowd of common men.”
—James Shirley (1596–1666)
“The night is of the color
Of a woman’s arm:
Night, the female,
Obscure,
Fragrant and supple,
Conceals herself.”
—Wallace Stevens (1879–1955)
“Slowly, silently, now the moon
Walks the night in her silver shoon;”
—Walter De La Mare (1873–1956)