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 pork sizzles and cries for fish. Luckily for the foolish race, and this particularly foolish generation of trout, the night shut down at last, not a little deepened by the dark side of Ktaadn, which, like a permanent shadow, reared itself from the eastern bank.”
—Henry David Thoreau (1817–1862)
“Death is an endless night so awful to contemplate that it can make us love life and value it with such passion that it may be the ultimate cause of all joy and all art.”
—Paul Theroux (b. 1941)
“I dreamed night after night that everyone in the world was dead excepting myself, and that upon me rested the responsibility of making a wagon wheel.”
—Jane Addams (1860–1935)