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Why do people use "skies" instead of "sky" (when, indeed, we only have one sky)?

Reach for the sky/skies!

and

I'm glad to finally see some blue skies.

I'm glad to finally see a blue sky.

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Similarly, "the heavens above". –  tenfour Jun 9 '11 at 23:26
    
Because there are 7 skies not 1 sky. There are 6 skies behind the 1 sky. –  user54822 Oct 24 '13 at 8:14

4 Answers 4

up vote 3 down vote accepted

Skies is a poetic/literary word used to mean heaven or "heavenly power." The first example sentence could mean "reach for heaven."

In some set phrases, the used word is skies, as in "he wrote to his sister praising Lizzie to the skies," where "to the skies" means very highly or enthusiastically.

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I always thought outlaws said "reach for the sky" when they were pointing a gun at you. On a completely unrelated note, the OED lists skyey as an adjective. Who knew! –  Tragicomic Jun 10 '11 at 8:53

According to the OED, the earliest meaning of "sky" in English was "cloud" (which is what "sky" still means in Scandinavian languages).

From that "the skies", originally meaning "the clouds", came to mean "heaven", or "sky" (in the modern sense).

The OED lists "sky" in the modern sense as the third meaning. It doesn't spell it out, but I think that what happened is that once "the skies" took on the meaning of "the expanse of heaven", it was no longer felt to be plural, so people started referring to it as "the sky". If this is correct, then "the skies" is simply an older form, which survives in poetic use and a few phrases.

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One should mention that in antiquity the celestial model was totally different of ours today. We know only one sky but in the model of the ancients there were seven spheres which might as well be called skies. The ancient needed seven spheres to explain the movement of the different celestial bodies.

English Wikipedia has an article on "celestial spheres". http://en.m.wikipedia.org/wiki/Celestial_spheres

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Hence also the idiom "seventh heaven." –  Sven Yargs Nov 14 at 20:14

I've never heard "reach for the skies", only "...sky".

"I'm glad to see some blue skies" implies multiple instances, e.g. a few days in a row with blue skies. (It's usually black in between. :-) ) "...a blue sky" means one sighting.

The other place where I've heard "skies" is with respect to airlines ("fly the friendly skies" is some airline's slogan). I think this is by analogy with "seas" and ships.

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There is also the expression to the skies: very highly; enthusiastically: "He wrote to his sister praising Lizzie to the skies." from my NOAD. :) –  Alenanno Jun 9 '11 at 22:47
    
Google results for "reach for the skies": google.com/… –  Chris Dwyer Jun 9 '11 at 22:57
    
Huh, thanks -- should have applied Google. I've heard "praise...to the heavens" but "...skies" is new to me. Not going to argue with NOAD, though. :-) –  Monica Cellio Jun 9 '11 at 23:09

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