DescriptionGnomonic.png	English: Gnomonic projection (projection from the center of the sphere) Latviešu: Gnomoniskā projekcija (projekcija no sfēras centra)
Date	8 May 2009
Source	Own work (Original text: Own work by uploader, created with Mathematica 7.0.1)
Author	Marozols
Other versions	This math image could be re-created using vector graphics as a SVG file. This has several advantages; see Commons:Media for cleanup for more information. If a SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}. It is recommended to name the SVG file “Gnomonic.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.

 This diagram was created with Mathematica.

 (*Origin*) o = {0, 0, 0}; (*Coordinate axis*) {ex, ey, ez} = IdentityMatrix[3]; (*With of the plane*) w = 2; (*Overhang coefficient*) \[Delta] = 1.2; (*Axis*) axis = {Black, Arrow3D[{o, w*ex}], Arrow3D[{o, w*ey}], Arrow3D[{o, w*ez}]}; (*Sphere*) sph = {Orange, Opacity[0.7], Sphere[o]}; (*Plane1*) pln1 = {LightGray, Polygon[{{-w, w, -1}, {w, w, -1}, {w, -w, -1}, {-w, -w, -1}}]}; (*Plane2*) pz = Normalize@{0.7, 0.3, 1.1}; px = Normalize@{-pz[[2]], pz[[1]], 0}; py = Last@Orthogonalize[{pz, px, ey}]; t = Abs[1/py[[3]]]; \[CurlyEpsilon] = 1.01; pln2 = {LightGray, Opacity[0.3], Polygon[(*(#-(\[CurlyEpsilon]-1)pz)&/@*){\[Delta]*px + \[Delta]*t* py, \[Delta]*px - \[Delta]*py, -\[Delta]*px - \[Delta]* py, -\[Delta]*px + \[Delta]*t*py}]}; (*Circle*) \[Gamma] = \[Pi]/4; MediumThick = Thickness[0.004]; crc = {Black, MediumThick, Line@Table[\[CurlyEpsilon] (px*Cos[\[Alpha]] + py*Sin[\[Alpha]]), {\[Alpha], (\[Pi] + \[Gamma])/2, 2 \[Pi] + (\[Pi] - \[Gamma])/2, 0.05}]}; (*Projection*) r = Table[ px*Cos[\[Alpha]] + py*Sin[\[Alpha]], {\[Alpha], (\[Pi] - \[Gamma])/ 2, (\[Pi] + \[Gamma])/2, \[Gamma]/6}]; r1 = (#/Abs[#[[3]]]) & /@ r; proj = {Black, PointSize[0.01], Point[o], Point /@ (\[CurlyEpsilon]*r), Point /@ r1, Line[{o, #}] & /@ r1, Red, MediumThick, Line[\[CurlyEpsilon]*r], Line[r1]}; (*Graphics*) DefaultThick = Thickness[0.0015]; g = Graphics3D[{DefaultThick, EdgeForm[DefaultThick], sph, pln1, pln2, crc, proj}, Boxed -> False, Lighting -> "Neutral", ViewPoint -> 2 {0.7, -0.3, 0.1}, ImageSize -> 600, Method -> {"ShrinkWrap" -> True}]; g = Append[g, PlotRegion -> {{-0.02, 1.02}, {-0.03, 1.03}}] 

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 This diagram was created with Mathematica by n.