instant vs sidereal day

instant

noun
  • A single, usually precise, point in time. 

  • A beverage or food which has been pre-processed to reduce preparation time, especially instant coffee. 

  • A very short period of time; a moment. 

adv
  • At once; immediately. 

adj
  • Present; current; extant. 

  • Very quickly and easily prepared. 

  • Of the current month. 

  • Occurring immediately; immediate; present. 

  • Lasting for a short moment; momentary; short-lived. 

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. 

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