Dark Clouds in a Perfect Sky was created in 2004-10.
dark blue the sky is light blue
A Perfect Sky was created on 2006-06-28.
when the sky is clear and sunny
When there are dark clouds in the sky, it is a sign that a rain shower is eminent. Clouds full of precipitation are much more dense than other clouds and as a result less sunlight can shine through causing the clouds to appear black.
Under a Dark Sky was created in 2008.
Dark Sky Observatory was created in 1981.
Because it is a shadow of the moon and the sky
Clouds never really "go" anywhere, though, clouds are always floating which, eventually, causes them to float away. There are still clouds in the sky when it gets dark but they are harder to see.
Today I noticed the dark clouds in the sky, and I decided not to take our dogs out for a walk, for fear of rain.
National Dark-Sky Week was created in 2003.
International Dark-Sky Association was created in 1988.
SKY Perfect JSAT Corporation was created on 1994-11-10.