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Definitions for "Diurnal motion"
Keywords:  apparent, celestial, daily, sky, rotation
Related Terms: Differential rotation, Nutation , Precession, Retrograde motion, Direct motion, Precession of the equinoxes, Solar day, Mean sun, Solar noon, Lunar day, Mean solar time, Sun-synchronous orbit, Equatorial orbit, Synchronous rotation, Revolution , Rising, Prograde, Oblateness, Retrograde, Polar orbit, Sidereal day, Revolve, Celestial sphere, Ecliptic, Elongation, Sunset, Sidereal time, Orbit , Proper motion, Transit, Synchronous orbit, Coriolis, Libration, Appulse, Stationary, Sunrise , Solar time, Equation of time, Ephemeris time, Aphelion, Coriolis effect, Descending node, Culmination, Opposition, Perihelion, Mean motion, Sidereal year, Heliostat, Sidereal period, Perigee
The daily motion of the sky. It appears that the daily motion is due to the rotation of the celestial sphere.  Today we realize that this apparent motion is actually due to the rotation of the earth.
cerritos.edu
the apparent daily motion caused by the Earth's rotation, of celestial bodies across the sky from east to west. UT1: the predicted value of the difference between UT1 and UTC, transmitted in code on broadcast time signals: UT1= UT1-UTC. (See Universal Time; Coordinated Universal Time.)
astronomy.gi
the apparent daily rotation of the heavens from east to west; an effect of Earth's rotation about its axis
quest.arc.nasa.gov
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