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1 definition found
 for Diurnal motion of the earth
From The Collaborative International Dictionary of English v.0.48 :

  Diurnal \Di*ur"nal\, a. [L. diurnalis, fr. dies day. See
     Deity, and cf. Journal.]
     1. Relating to the daytime; belonging to the period of
        daylight, distinguished from the night; -- opposed to
        nocturnal; as, diurnal heat; diurnal hours.
        [1913 Webster]
     2. Daily; recurring every day; performed in a day; going
        through its changes in a day; constituting the measure of
        a day; as, a diurnal fever; a diurnal task; diurnal
        aberration, or diurnal parallax; the diurnal revolution of
        the earth.
        [1913 Webster]
              Ere twice the horses of the sun shall bring
              Their fiery torcher his diurnal ring. --Shak.
        [1913 Webster]
     3. (Bot.) Opening during the day, and closing at night; --
        said of flowers or leaves.
        [1913 Webster]
     4. (Zool.) Active by day; -- applied especially to the eagles
        and hawks among raptorial birds, and to butterflies
        (Diurna) among insects.
        [1913 Webster]
     Diurnal aberration (Anat.), the aberration of light arising
        from the effect of the earth's rotation upon the apparent
        direction of motion of light.
     Diurnal arc, 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.
     Diurnal circle, the apparent circle described by a
        celestial body in consequence of the earth's rotation.
     Diurnal motion of the earth, the motion of the earth upon
        its axis which is described in twenty-four hours.
     Diurnal motion of a heavenly body, that apparent motion of
        the heavenly body which is due to the earth's diurnal
     Diurnal parallax. See under Parallax.
     Diurnal revolution of a planet, the motion of the planet
        upon its own axis which constitutes one complete
     Syn: See Daily.
          [1913 Webster]

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