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gnomonic    音标拼音: [nom'ɑnɪk]
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Gnomonic \Gno*mon"ic\, Gnomonical \Gno*mon"ic*al\, a. [L.
gnomonicus, Gr. ?: cf. F. gnomonique. See {Gnomon}.]
Of or pertaining to the gnomon, or the art of dialing.
[1913 Webster]

{Gnomonic projection}, a projection of the circles of the
sphere, in which the point of sight is taken at the center
of the sphere, and the principal plane is tangent to the
surface of the sphere. "The gnomonic projection derives
its name from the connection between the methods of
describing it and those for the construction of a gnomon
or dial." --Cyc. of Arts & Sciences.
[1913 Webster]


Projection \Pro*jec"tion\, n. [L. projectio: cf. F. projection.]
[1913 Webster]
1. The act of throwing or shooting forward.
[1913 Webster]

2. A jutting out; also, a part jutting out, as of a building;
an extension beyond something else.
[1913 Webster]

3. The act of scheming or planning; also, that which is
planned; contrivance; design; plan. --Davenant.
[1913 Webster]

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.
[1913 Webster]

5. (Geog.) Any method of representing the surface of the
earth upon a plane.
[1913 Webster]

{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
point.

{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.
[1913 Webster]

Syn: See {Protuberance}.
[1913 Webster]
[1913 Webster]


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  • Gnomonic projection - Wikipedia
    A gnomonic projection, also known as a central projection or rectilinear projection, is a perspective projection of a sphere, with center of projection at the sphere's center, onto any plane not passing through the center, most commonly a tangent plane
  • Gnomonic Projection -- from Wolfram MathWorld
    The gnomonic projection is a nonconformal map projection obtained by projecting points P_1 (or P_2) on the surface of sphere from a sphere's center O to point P in a plane that is tangent to a point S (Coxeter 1969, p 93)
  • GNOMONIC Definition Meaning - Merriam-Webster
    The meaning of GNOMONIC is of or relating to the gnomon of a sundial or its use in telling time
  • gnomonic - Gnomonic Projection - MATLAB - MathWorks
    Its name is derived from the gnomon, the face of a sundial, since the meridians radiate like hour markings This projection is also known as a gnomic or central projection This implementation of the gnomonic projection is applicable only for coordinates that are referenced to a sphere
  • 22. Gnomonic projection | Eu, Mircea - neacsu. net
    The Gnomonic is the perspective projection of the globe from the center onto a plane tangent to the surface It was used by Thales (636?-546?B C ) of Miletus for star maps Called “horologium” (sundial or clock) in early times, it was given the name “gnomonic” in the 19th century
  • Gnomonic Projection: Advantages and Disadvantages Uncovered - HPD CONSULT
    The gnomonic projection is commonly used for navigational maps at large scales, displaying less than one-sixth of the planet’s surface Its ability to project great circles as straight lines makes it ideal for highlighting the shortest distance routes
  • Azimuthal Projection: Orthographic, Stereographic and Gnomonic
    The azimuthal projection plots the surface of Earth using a flat plane For example, common azimuthal projections are gnomonic, stereographic orthographic
  • What Is Gnomonic Projection? - Civil Stuff
    A gnomonic map projection is a map projection that depicts all great circles as straight lines, with any straight-line segment on a gnomonic map displaying a geodesic, the shortest route between the segment’s two endpoints
  • Gnomonic vs. Mercator vs. Conic Projection | Overview Examples
    The Gnomonic projection is a type of azimuthal projection, so all angles from the tangent point are preserved Gnomonic projection is used primarily in seismic work, photography, and star
  • GNOMONIC Definition Meaning | Dictionary. com
    of or relating to a gnomon or to a sundial of or relating to the measurement of time by a gnomon or a sundial gnomic 2 a gnomonic chart 1595–1605; < Latin gnōmonicus “of, belonging to a gnomon” < Greek gnōmonikós See gnomon, -ic Examples have not been reviewed





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