What is "under open sky"

Sky \Sky\ (sk[imac]), n.; pl. Skies (sk[imac]z). [OE. skie a cloud, Icel. sk[=y]; akin to Sw. & Dan. sky; cf. AS. sc[=u]a, sc[=u]wa, shadow, Icel. skuggi; probably from the same root as E. scum. [root]158. See Scum, and cf. Hide skin, Obscure.]

1. A cloud. [Obs.]

   [A wind] that blew so hideously and high, That it ne lefte not a sky In all the welkin long and broad.
   --Chaucer.

2. Hence, a shadow. [Obs.]

   She passeth as it were a sky.
   --Gower.

3. The apparent arch, or vault, of heaven, which in a clear day is of a blue color; the heavens; the firmament; -- sometimes in the plural.

   The Norweyan banners flout the sky.
   --Shak.

4. The wheather; the climate.

   Thou wert better in thy grave than to answer with thy uncovered body this extremity of the skies.
   --Shak.

   Note: Sky is often used adjectively or in the formation of self-explaining compounds; as, sky color, skylight, sky-aspiring, sky-born, sky-pointing, sky-roofed, etc.

   Sky blue, an azure color.

   Sky scraper (Naut.), a skysail of a triangular form.
   --Totten.

   Under open sky, out of doors. ``Under open sky adored.''
   --Milton.