sidereal day vs sunshine

sidereal day

noun
  • One day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds). 

  • The rotational period of Earth; the time in which Earth rotates around its axis 360 degrees. 

sunshine

adj
  • Open to and permitting public access, especially with regard to activities that were previously closed-door or back-room meetings. 

noun
  • Geniality or cheerfulness. 

  • Used to address someone who has just woken up and/or is very sleepy. 

  • A location on which the sun's rays fall. 

  • The effect which the sun has when it lights and warms some place. 

  • The direct rays, light or warmth of the sun. 

  • Friendly form of address often reserved for juniors. 

  • Ironic form of address used to an inferior or troublemaker. 

  • A source of cheerfulness or joy. 

How often have the words sidereal day and sunshine occurred in a corpus of books? (source: Google Ngram Viewer )