gnomonic 音标拼音: [nom'ɑnɪk]
指时针
指时针
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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