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:
“I believe in the forest, and in the meadow, and in the night in which the corn grows.”
—Henry David Thoreau (1817–1862)
“The longest day must have its close—the gloomiest night will wear on to a morning. An eternal, inexorable lapse of moments is ever hurrying the day of the evil to an eternal night, and the night of the just to an eternal day.”
—Harriet Beecher Stowe (1811–1896)
“The night is freezing fast,
To-morrow comes December.”
—A.E. (Alfred Edward)