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gnomonic

## gnomonic

2  definitions  found

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

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

2.  A  jutting  out  also  a  part  jutting  out  as  of  a  building;
an  extension  beyond  something  else.

3.  The  act  of  scheming  or  planning;  also  that  which  is
planned;  contrivance;  design;  plan  --Davenant.

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

5.  (Geog.)  Any  method  of  representing  the  surface  of  the
earth  upon  a  plane.

{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

Syn:  See  {Protuberance}.

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

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.

{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.