Yes.
Duskiness is a word that can be used to describe a darkening sky.
The word "shade" implies darkening. So, yeah, it probably is.
Yes. Darkening is most commonly used as a verb, but it can be an adjective. In a sentence like "Under the darkening clouds" it is an adjective.
Darkening Sky was created on 2010-10-22.
Fugue for a Darkening Island was created in 1972.
Mona on Darkening Ground was created in 2001.
The Darkening - 2012 is rated/received certificates of: USA:R
Fugue for a Darkening Island has 125 pages.
The Darkening - 1995 is rated/received certificates of: USA:PG-13
Three participles that can describe "night" are "darkening," "silent," and "mysterious." "Darkening" conveys the transition into night, while "silent" evokes the calmness that often accompanies nighttime. "Mysterious" suggests the intrigue and uncertainty that night can bring.
The ISBN of Fugue for a Darkening Island is 0-450-01575-0.
The ISBN of Mona on Darkening Ground is 1-58297-220-6.