24-Feb-2016 16:46

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When the Sun reaches 18 degrees below the horizon, the twilight's brightness is nearly zero, and evening twilight becomes nighttime.When the Sun again reaches 18 degrees below the horizon, nighttime becomes morning twilight.Owing to its distinctive quality, primarily the absence of shadows and the appearance of objects silhouetted against the bright sky, twilight has long been popular with photographers, who refer to it as 'sweet light', and painters, who refer to it as the blue hour, after the French expression: l'heure bleue.Twilight should not be confused with auroras, which can have a similar appearance in the night sky at high latitudes.Twilight is the illumination of the Earth's lower atmosphere when the Sun itself is not directly visible because it is below the horizon.

There is enough light from the sun during this period that artificial sources of light may not be needed to carry on outdoor activities.

This concept is sometimes enshrined in laws, for example, when drivers of automobiles must turn on their headlights (called lighting-up time in the UK); when pilots may exercise the privilege to fly aircraft; restrictions on hunting; or if the crime of burglary is to be treated as nighttime burglary, which carries stiffer penalties in some jurisdictions.

By analogy with evening twilight, the word "twilight" is also sometimes used metaphorically, to imply that something is losing strength and approaching its end.

For example, a very old man may be said to be in the twilight of his life.

The collateral adjective for twilight is crepuscular; it is most frequently encountered when applied to certain insects, fish and mammals that are most active during that time.

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