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:
“Oh! a private buffoon is a light-hearted loon,
If you listen to popular rumour;
From morning to night he’s so joyous and bright,
And he bubbles with wit and good humour!”
—Sir William Schwenck Gilbert (1836–1911)
“Pour down your warmth, great sun!
While we bask, we two together.
Two together!
Winds blow south, or winds blow north,
Day come white, or night come black,
Home, or rivers and mountains from home,
Singing all time, minding no time,
While we two keep together.”
—Walt Whitman (1819–1892)
“When will the veil be lifted that casts so black a night over the universe? God of Israel, lift at last the gloom: For how long will you be hidden?”
—Jean Racine (1639–1699)