at three o'clock vs right-hand

at three o'clock

right-hand

adj

  • in the direction or orientation to the right-hand rule (a right-hand thread) 

  • designed for use by the right hand 

  • of, relating to, or located on the right 

How often have the words at three o'clock and right-hand occurred in a corpus of books? (source: Google Ngram Viewer )