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:
“And so they have left us feeling tired and old.
They never cared for school anyway.
And they have left us with the things pinned on the bulletin board.
And the night, the endless, muggy night that is invading our school.”
—John Ashbery (b. 1927)
“Captain Quinlan: When this case is over, I’ll come around some night and sample some of your chili.
Tanya: Better be careful. May be too hot for you.”
—Orson Welles (1915–1985)
“Such night in England ne’er had been, nor e’er again shall be.”
—Thomas Babington Macaulay (1800–1859)