diurnal : Idioms & Phrases

• (Anat.), the aberration of light arising from the effect of the earth's rotation upon the apparent direction of motion of light.

Webster 1913

• the arc described by the sun during the daytime or while above the horizon; hence, the arc described by the moon or a star from rising to setting.

Webster 1913

• the apparent circle described by a celestial body in consequence of the earth's rotation.

Webster 1913

• that apparent motion of the heavenly body which is due to the earth's diurnal motion.

Webster 1913

• the motion of the earth upon its axis which is described in twentyfour hours.

Webster 1913

• noun the parallax of a celestial body using two points on the surface of the earth as the earth rotates
  geocentric parallax.
  

WordNet

• . See under Parallax.

Webster 1913

• the motion of the planet upon its own axis which constitutes one complete revolution.

Webster 1913

• noun fluctuations that occur during each day
  

WordNet