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2 definitions found
 for Polar projection
From The Collaborative International Dictionary of English v.0.48 :

  Polar \Po"lar\, a. [Cf. F. polaire. See Pole of the earth.]
     1. Of or pertaining to one of the poles of the earth, or of a
        sphere; situated near, or proceeding from, one of the
        poles; as, polar regions; polar seas; polar winds.
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     2. Of or pertaining to the magnetic pole, or to the point to
        which the magnetic needle is directed.
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     3. (Geom.) Pertaining to, reckoned from, or having a common
        radiating point; as, polar coordinates.
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     Polar axis, that axis of an astronomical instrument, as an
        equatorial, which is parallel to the earths axis.
     Polar+bear+(Zool.),+a+large+bear+({Ursus+maritimus">Polar bear (Zool.), a large bear ({Ursus maritimus syn.
        Thalarctos maritimus) inhabiting the arctic regions. It
        sometimes measures nearly nine feet in length and weighs
        1,600 pounds. It is partially amphibious, very powerful,
        and the most carnivorous of all the bears. The fur is
        white, tinged with yellow. Called also White bear. See
     Polar body, Polar cell, or Polar globule (Biol.), a
        minute cell which separates by karyokinesis from the ovum
        during its maturation. In the maturation of ordinary ova
        two polar bodies are formed, but in parthogenetic ova only
        one. The first polar body formed is usually larger than
        the second one, and often divides into two after its
        separation from the ovum. Each of the polar bodies removes
        maternal chromatin from the ovum to make room for the
        chromatin of the fertilizing spermatozoon; but their
        functions are not fully understood.
     Polar circles (Astron. & Geog.), two circles, each at a
        distance from a pole of the earth equal to the obliquity
        of the ecliptic, or about 23[deg] 28', the northern called
        the arctic circle, and the southern the antarctic circle.
     Polar clock, a tube, containing a polarizing apparatus,
        turning on an axis parallel to that of the earth, and
        indicating the hour of the day on an hour circle, by being
        turned toward the plane of maximum polarization of the
        light of the sky, which is always 90[deg] from the sun.
     Polar coordinates. See under 3d Coordinate.
     Polar dial, a dial whose plane is parallel to a great
        circle passing through the poles of the earth. --Math.
     Polar distance, the angular distance of any point on a
        sphere from one of its poles, particularly of a heavenly
        body from the north pole of the heavens.
     Polar equation of a line or Polar equation of a surface,
        an equation which expresses the relation between the polar
        coordinates of every point of the line or surface.
     Polar forces (Physics), forces that are developed and act
        in pairs, with opposite tendencies or properties in the
        two elements, as magnetism, electricity, etc.
     Polar hare (Zool.), a large hare of Arctic America ({Lepus
        arcticus), which turns pure white in winter. It is
        probably a variety of the common European hare ({Lepus
     Polar lights, the aurora borealis or australis.
     Polar opposition, or Polaric opposition or Polar
     contrast or Polaric contrast (Logic), an opposition or
        contrast made by the existence of two opposite conceptions
        which are the extremes in a species, as white and black in
        colors; hence, as great an opposition or contrast as
     Polar projection. See under Projection.
     Polar spherical triangle (Spherics), a spherical triangle
        whose three angular points are poles of the sides of a
        given triangle. See 4th Pole, 2.
     Polar whale (Zool.), the right whale, or bowhead. See
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From The Collaborative International Dictionary of English v.0.48 :

  Projection \Pro*jec"tion\, n. [L. projectio: cf. F. projection.]
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     1. The act of throwing or shooting forward.
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     2. A jutting out; also, a part jutting out, as of a building;
        an extension beyond something else.
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     3. The act of scheming or planning; also, that which is
        planned; contrivance; design; plan. --Davenant.
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     4. (Persp.) The representation of something; delineation;
        plan; especially, the representation of any object on a
        perspective plane, or such a delineation as would result
        were the chief points of the object thrown forward upon
        the plane, each in the direction of a line drawn through
        it from a given point of sight, or central point; as, the
        projection of a sphere. The several kinds of projection
        differ according to the assumed point of sight and plane
        of projection in each.
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     5. (Geog.) Any method of representing the surface of the
        earth upon a plane.
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     Conical projection, a mode of representing the sphere, the
        spherical surface being projected upon the surface of a
        cone tangent to the sphere, the point of sight being at
        the center of the sphere.
     Cylindric projection, a mode of representing the sphere,
        the spherical surface being projected upon the surface of
        a cylinder touching the sphere, the point of sight being
        at the center of the sphere.
     Globular, Gnomonic, Orthographic, projection,etc. See
        under Globular, Gnomonic, etc.
     Mercator's projection, a mode of representing the sphere in
        which the meridians are drawn parallel to each other, and
        the parallels of latitude are straight lines whose
        distance from each other increases with their distance
        from the equator, so that at all places the degrees of
        latitude and longitude have to each other the same ratio
        as on the sphere itself.
     Oblique projection, a projection made by parallel lines
        drawn from every point of a figure and meeting the plane
        of projection obliquely.
     Polar projection, a projection of the sphere in which the
        point of sight is at the center, and the plane of
        projection passes through one of the polar circles.
     Powder of projection (Alchemy.), a certain powder cast into
        a crucible or other vessel containing prepared metal or
        other matter which is to be thereby transmuted into gold.
     Projection of a point on a plane (Descriptive Geom.), the
        foot of a perpendicular to the plane drawn through the
     Projection of a straight line of a plane, the straight line
        of the plane connecting the feet of the perpendiculars let
        fall from the extremities of the given line.
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     Syn: See Protuberance.
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