in the sky vs on top of

in the sky

on top of

prep

  • Atop 

  • Fully informed about, and in control of, something; up to speed with. 

  • Very close to, in any orientation or in time. 

  • In addition to something else. 

How often have the words in the sky and on top of occurred in a corpus of books? (source: Google Ngram Viewer )