Changes

==Etymology==

==Etymology==

[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], cloud, sky, from Old Norse skȳ cloud; akin to [https://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] scēo cloud

[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], cloud, sky, from Old Norse skȳ cloud; akin to [https://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] scēo cloud

*Date: [http://www.wikipedia.org/wiki/13th_Century 13th century]

*Date: [https://www.wikipedia.org/wiki/13th_Century 13th century]

==Definitions==

==Definitions==

*1 : the upper [[atmosphere]] or expanse of [[space]] that [[constitutes]] an apparent great vault or arch over the [[earth]]

*1 : the upper [[atmosphere]] or expanse of [[space]] that [[constitutes]] an apparent great vault or arch over the [[earth]]

:b : [[climate]] <temperate English skies — G. G. Coulton>

:b : [[climate]] <temperate English skies — G. G. Coulton>

==Description==

==Description==

The '''sky''' is the part of the [[atmosphere]]  or of outer [[space]] visible from the [[surface]] of any astronomical object. It is [[difficult]] to define precisely for several reasons. During daylight, the sky of [[Earth]] has the [[appearance]] of a deep [http://en.wikipedia.org/wiki/Blue blue] surface because of the air's scattering  of [http://en.wikipedia.org/wiki/Sunlight sunlight]. The sky is sometimes defined as the denser [[gaseous]] zone of a [[planet]]'s atmosphere. At [[night]] the sky has the [[appearance]] of a black surface or region scattered with [[stars]].

The '''sky''' is the part of the [[atmosphere]]  or of outer [[space]] visible from the [[surface]] of any astronomical object. It is [[difficult]] to define precisely for several reasons. During daylight, the sky of [[Earth]] has the [[appearance]] of a deep [https://en.wikipedia.org/wiki/Blue blue] surface because of the air's scattering  of [https://en.wikipedia.org/wiki/Sunlight sunlight]. The sky is sometimes defined as the denser [[gaseous]] zone of a [[planet]]'s atmosphere. At [[night]] the sky has the [[appearance]] of a black surface or region scattered with [[stars]].

During the day the [[Sun]] can be seen in the sky, unless obscured by clouds. In the night sky (and to some extent during the day) the [[moon]], [[planets]] and [[stars]] are visible in the sky. Some of the [[natural]] [[phenomena]] seen in the sky are clouds, rainbows, and [[aurora]]e. Lightning and precipitation can also be seen in the sky during storms. On Earth, birds, insects, aircraft, and kites are often considered to fly in the sky. As a result of [[human]] [[activities]], smog during the day and light [[radiance]] during the night are often seen above large [[cities]] (see also light pollution).

During the day the [[Sun]] can be seen in the sky, unless obscured by clouds. In the night sky (and to some extent during the day) the [[moon]], [[planets]] and [[stars]] are visible in the sky. Some of the [[natural]] [[phenomena]] seen in the sky are clouds, rainbows, and [[aurora]]e. Lightning and precipitation can also be seen in the sky during storms. On Earth, birds, insects, aircraft, and kites are often considered to fly in the sky. As a result of [[human]] [[activities]], smog during the day and light [[radiance]] during the night are often seen above large [[cities]] (see also light pollution).

In the field of [[astronomy]], the sky is also called the [[celestial]] [[sphere]]. This is an imaginary dome where the [[sun]], [[stars]], [[planets]], and the [[moon]] are seen to be traveling. The celestial sphere is divided into regions called [[constellations]].[http://en.wikipedia.org/wiki/Sky]

In the field of [[astronomy]], the sky is also called the [[celestial]] [[sphere]]. This is an imaginary dome where the [[sun]], [[stars]], [[planets]], and the [[moon]] are seen to be traveling. The celestial sphere is divided into regions called [[constellations]].[https://en.wikipedia.org/wiki/Sky]

==See also==

==See also==

*'''''[[Clouds]]'''''

*'''''[[Clouds]]'''''