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4 definitions found
 for right ascension
From The Collaborative International Dictionary of English v.0.48 :

  Refraction \Re*frac"tion\ (r?*fr?k"sh?n), n. [F. r['e]fraction.]
     1. The act of refracting, or the state of being refracted.
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     2. The change in the direction of ray of light, heat, or the
        like, when it enters obliquely a medium of a different
        density from that through which it has previously moved.
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              Refraction out of the rarer medium into the denser,
              is made towards the perpendicular.    --Sir I.
                                                    Newton.
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     3. (Astron.)
        (a) The change in the direction of a ray of light, and,
            consequently, in the apparent position of a heavenly
            body from which it emanates, arising from its passage
            through the earth's atmosphere; -- hence distinguished
            as atmospheric refraction, or astronomical refraction.
        (b) The correction which is to be deducted from the
            apparent altitude of a heavenly body on account of
            atmospheric refraction, in order to obtain the true
            altitude.
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     Angle of refraction (Opt.), the angle which a refracted ray
        makes with the perpendicular to the surface separating the
        two media traversed by the ray.
  
     Conical refraction (Opt.), the refraction of a ray of light
        into an infinite number of rays, forming a hollow cone.
        This occurs when a ray of light is passed through crystals
        of some substances, under certain circumstances. Conical
        refraction is of two kinds; external conical refraction,
        in which the ray issues from the crystal in the form of a
        cone, the vertex of which is at the point of emergence;
        and internal conical refraction, in which the ray is
        changed into the form of a cone on entering the crystal,
        from which it issues in the form of a hollow cylinder.
        This singular phenomenon was first discovered by Sir W. R.
        Hamilton by mathematical reasoning alone, unaided by
        experiment.
  
     Differential refraction (Astron.), the change of the
        apparent place of one object relative to a second object
        near it, due to refraction; also, the correction required
        to be made to the observed relative places of the two
        bodies.
  
     Double refraction (Opt.), the refraction of light in two
        directions, which produces two distinct images. The power
        of double refraction is possessed by all crystals except
        those of the isometric system. A uniaxial crystal is said
        to be optically positive (like quartz), or optically
        negative (like calcite), or to have positive, or negative,
        double refraction, according as the optic axis is the axis
        of least or greatest elasticity for light; a biaxial
        crystal is similarly designated when the same relation
        holds for the acute bisectrix.
  
     Index of refraction. See under Index.
  
     Refraction circle (Opt.), an instrument provided with a
        graduated circle for the measurement of refraction.
  
     Refraction of latitude, longitude, declination, right
     ascension, etc., the change in the apparent latitude,
        longitude, etc., of a heavenly body, due to the effect of
        atmospheric refraction.
  
     Terrestrial refraction, the change in the apparent altitude
        of a distant point on or near the earth's surface, as the
        top of a mountain, arising from the passage of light from
        it to the eye through atmospheric strata of varying
        density.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Right \Right\ (r[imac]t), a. [OE. right, riht, AS. riht; akin to
     D. regt, OS. & OHG. reht, G. recht, Dan. ret, Sw. r[aum]tt,
     Icel. rettr, Goth. ra['i]hts, L. rectus, p. p. of regere to
     guide, rule; cf. Skr. [.r]ju straight, right. [root]115. Cf.
     Adroit,{Alert">Adroit,{Alert, Correct, Dress, Regular, Rector,
     Recto, Rectum, Regent, Region, Realm, Rich,
     Royal, Rule.]
     1. Straight; direct; not crooked; as, a right line. "Right as
        any line." --Chaucer
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     2. Upright; erect from a base; having an upright axis; not
        oblique; as, right ascension; a right pyramid or cone.
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     3. Conformed to the constitution of man and the will of God,
        or to justice and equity; not deviating from the true and
        just; according with truth and duty; just; true.
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              That which is conformable to the Supreme Rule is
              absolutely right, and is called right simply without
              relation to a special end.            --Whately.
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     2. Fit; suitable; proper; correct; becoming; as, the right
        man in the right place; the right way from London to
        Oxford.
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     5. Characterized by reality or genuineness; real; actual; not
        spurious. "His right wife." --Chaucer.
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              In this battle, . . . the Britons never more plainly
              manifested themselves to be right barbarians.
                                                    --Milton.
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     6. According with truth; passing a true judgment; conforming
        to fact or intent; not mistaken or wrong; not erroneous;
        correct; as, this is the right faith.
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              You are right, Justice, and you weigh this well.
                                                    --Shak.
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              If there be no prospect beyond the grave, the
              inference is . . . right, "Let us eat and drink, for
              to-morrow we die."                    --Locke.
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     7. Most favorable or convenient; fortunate.
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              The lady has been disappointed on the right side.
                                                    --Spectator.
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     8. Of or pertaining to that side of the body in man on which
        the muscular action is usually stronger than on the other
        side; -- opposed to left when used in reference to a part
        of the body; as, the right side, hand, arm. Also applied
        to the corresponding side of the lower animals.
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              Became the sovereign's favorite, his right hand.
                                                    --Longfellow.
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     Note: In designating the banks of a river, right and left are
           used always with reference to the position of one who
           is facing in the direction of the current's flow.
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     9. Well placed, disposed, or adjusted; orderly; well
        regulated; correctly done.
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     10. Designed to be placed or worn outward; as, the right side
         of a piece of cloth.
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     At right angles, so as to form a right angle or right
        angles, as when one line crosses another perpendicularly.
        
  
     Right and left, in both or all directions. [Colloq.]
  
     Right and left coupling (Pipe fitting), a coupling the
        opposite ends of which are tapped for a right-handed screw
        and a left-handed screw, respectivelly.
  
     Right angle.
         (a) The angle formed by one line meeting another
             perpendicularly, as the angles ABD, DBC.
         (b) (Spherics) A spherical angle included between the
             axes of two great circles whose planes are
             perpendicular to each other.
  
     Right ascension. See under Ascension.
  
     Right Center (Politics), those members belonging to the
        Center in a legislative assembly who have sympathies with
        the Right on political questions. See Center, n., 5.
  
     Right cone, Right cylinder, Right prism, Right
     pyramid (Geom.), a cone, cylinder, prism, or pyramid, the
        axis of which is perpendicular to the base.
  
     Right line. See under Line.
  
     Right sailing (Naut.), sailing on one of the four cardinal
        points, so as to alter a ship's latitude or its longitude,
        but not both. --Ham. Nav. Encyc.
  
     Right sphere (Astron. & Geol.), a sphere in such a position
        that the equator cuts the horizon at right angles; in
        spherical projections, that position of the sphere in
        which the primitive plane coincides with the plane of the
        equator.
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     Note: Right is used elliptically for it is right, what you
           say is right, true.
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                 "Right," cries his lordship.       --Pope.
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     Syn: Straight; direct; perpendicular; upright; lawful;
          rightful; true; correct; just; equitable; proper;
          suitable; becoming.
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From The Collaborative International Dictionary of English v.0.48 :

  Ascension \As*cen"sion\, n. [F. ascension, L. ascensio, fr.
     ascendere. See Ascend.]
     1. The act of ascending; a rising; ascent.
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     2. Specifically: The visible ascent of our Savior on the
        fortieth day after his resurrection. (--Acts i. 9.) Also,
        Ascension Day.
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     3. An ascending or arising, as in distillation; also that
        which arises, as from distillation.
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              Vaporous ascensions from the stomach. --Sir T.
                                                    Browne.
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     Ascension Day, the Thursday but one before Whitsuntide, the
        day on which commemorated our Savior's ascension into
        heaven after his resurrection; -- called also Holy
        Thursday.
  
     Right ascension (Astron.), that degree of the equinoctial,
        counted from the beginning of Aries, which rises with a
        star, or other celestial body, in a right sphere; or the
        arc of the equator intercepted between the first point of
        Aries and that point of the equator that comes to the
        meridian with the star; -- expressed either in degrees or
        in time.
  
     Oblique ascension (Astron.), an arc of the equator,
        intercepted between the first point of Aries and that
        point of the equator which rises together with a star, in
        an oblique sphere; or the arc of the equator intercepted
        between the first point of Aries and that point of the
        equator that comes to the horizon with a star. It is
        little used in modern astronomy.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  right ascension
      n 1: (astronomy) the equatorial coordinate specifying the angle,
           measured eastward along the celestial equator, from the
           vernal equinox to the intersection of the hour circle that
           passes through an object in the sky; usually expressed in
           hours and minutes and seconds; used with declination to
           specify positions on the celestial sphere; "one hour of
           right ascension equals fifteen degrees" [syn: right
           ascension, RA, celestial longitude]

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