sidereal day vs sun

sidereal day

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

  • 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). 

sun

noun
  • A revolution of the Earth around the Sun; a year. 

  • A star, especially when seen as the centre of any single solar system. 

  • The thirty-first Lenormand card. 

  • The nineteenth trump/major arcana card of the Tarot. 

  • Sunrise or sunset. 

  • The light and warmth which is received from the sun; sunshine or sunlight. 

  • A transversing of the sky by the Sun; a day. 

  • A traditional Japanese unit of length, approximately 30.3 millimetres (1.193 inches). 

  • Something like the sun in brightness or splendor. 

name
  • The star that the Earth revolves around and from which it receives light and warmth. 

verb
  • To warm or dry in the sunshine. 

  • To be exposed to the sun. 

  • To expose the eyes to the sun as part of the Bates method. 

  • To expose to the warmth and radiation of the sun. 

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