zenith-skyhttp://www.oed.com/dictionary/zenith-sky_n%3Ftab%3Dmeaning_and_usezenith sky, n.
Revised 2018

zenith skynoun

  1. 1811–
    1. 1811
      Our gilded sterns point to the zenith sky.
      T. Adams, Poetical Works 107
    2. 1938
      The measurement of the brightness of the light in the zenith sky an hour after sunset and an hour before sunrise made the findings possible.
      Science 22 July 8/1
    3. 2001
      Welbon would rather..recite fluctuations in air pressure or light levels of the zenith sky.
      St. Petersburg (Florida) Times (Nexis) 16 December 1d

Originally published as part of the entry for zenith, n. & adj.

zenith, n. & adj. was revised in June 2018.