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May 11

Twilight Zone Day

Arctic Twilight
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Arctic Twilight
Photo by Josie Shields, at ECCC Lab in Alert, Nunavut the most northern permanently inhabited region on earth
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"It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition, and it lies between the pit of man's fears and the summit of his knowledge. This is the dimension of imagination. It is an area which we call the Twilight Zone."

~ The Twilight Zone (1959 television series opening)

In human history and related folklore, twilight is considered a liminal time, a transitional period in which all kinds, social hierarchies may be reversed or temporarily dissolved, continuity of tradition may become uncertain, and future outcomes once taken for granted may be thrown into doubt.   Many cultures regard it as a time especially prone to hauntings by witches, spirits, faeries or particularly ghosts -- liminal beings, neither alive nor dead.

 

Twilight on Earth is the illumination of the lower atmosphere when the Sun itself is not directly visible because it is below the horizon. Twilight is produced by sunlightscattering in the upper atmosphere, illuminating the lower atmosphere so that Earth's surface is neither completely lit nor completely dark. 

There are three established and widely accepted subcategories of twilight: civil twilight (brightest), nautical twilight, and astronomical twilight (darkest).

The collateral adjective for twilight is crepuscular which is sometimes applied to insectsfish, and mammals that are most active during that time.

Atmospheric phenomenon which can be observed during the progression of twilight include the Belt of Venus, and Earth's shadow. 

The Belt of Venus, Venus's Girdle is visible shortly before sunrise or after sunset, during civil twilight, when a pinkish glow extending roughly 10–20° above the horizon surrounds the observer.

Earth's shadow or Earth shadow is the shadow that Earth itself casts onto its atmosphere and into outer space, toward the antisolar point. During twilight (both early dusk and late dawn), the shadow's visible fringe (sometimes called the dark segment or twilight wedge appears in a clear sky as a dark and diffused band low above the horizon.

 

For more on the sustained twilight of May (the "bright nights") experienced in Denmark, click the picture of Arctic twilight by Josie Shields.