Dusk - Wikipedia, the free encyclopedia

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** Dusk **

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For other uses, see Dusk (disambiguation).
Not to be confused with sunset.
Civil, nautical, and astronomical twilight. Dusk is the end of evening
twilight^[1]

*Dusk* is the darkest stage of twilight in the evening. During early to
intermediate stages of twilight, there may be enough light in the sky under
clear-sky conditions to read outdoors without artificial illumination.
*Civil dusk* occurs when the earth rotates to a point at which the center
of the sun is at 6° below the local horizon. This marks the end of the
evening civil twilight, the point where artificial illumination is required
to read outside.^[2] Twilight comes after /sunset/, which is the point at
which the earth has rotated just enough that the sun is no longer visible
on the local horizon (under clear conditions).

*Contents*

· 1 Technical definitions
· 2 See also
· 3 References




*Technical definitions[edit]*

Silhouette of a tree at dusk

There are also more technical definitions of dusk, including the following:

* Civil dusk 
The time at which the sun is 6 degrees below the horizon in the
evening. At this time objects are distinguishable and some stars and
planets are visible to the naked eye.

* Nautical dusk 
Is when the sun is 12 degrees below the horizon in the evening. At
this time, objects are no longer distinguishable, and the horizon is no
longer visible to the naked eye.

* Astronomical dusk 
The time at which the sun is 18 degrees below the horizon in the
evening. At this time the sun no longer illuminates the sky, and thus no
longer interferes with astronomical observations.

Seattle, Washington at dusk




· Dusk in Porto Covo, west coast of


Source: en.wikipedia.org/wiki/Dusk


when is dusk

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