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I want to combine this map as "background" of this combined plot.
How can I do it?
The documentation doesn't show any similar demonstration.

GeoGraphics[ GeoRange -> "World", GeoBackground -> Automatic, 
             GeoProjection -> {"Orthographic", "Centering" -> GeoPosition[{90, 0}]},
             AspectRatio -> 1/2]

  ParametricPlot[{R Cos[t], r Sin[t]}, {t, 0, 2 Pi}, 
                  PlotStyle -> Directive[RGBColor[0.75, 0.75, 0.75]]], 
  ListPlot[ Table[{{R Cos[t], r Sin[t]}}, {t, 0, 2 Pi, 2 Pi/24}], 
            PlotStyle -> Directive[PointSize[Large], Orange]], 
  Axes -> False, Frame -> False, FrameTicks -> Automatic, 
  ImageSize -> Full, PlotRange -> All, AspectRatio -> 1/2] 
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what value of R, and r? – Eric Brown Aug 24 '14 at 12:46
geo =
 GeoGraphics[GeoRange -> "World",
  GeoBackground -> Automatic,
  GeoProjection -> {"Orthographic", "Centering" -> GeoPosition[{90, 0}]},
  AspectRatio -> 1/2];

plo =
 ParametricPlot[{Cos[t], Sin[t]}, {t, 0, 2 Pi},
  PlotStyle -> Red,
  AspectRatio -> 1/2];

Show[Graphics @@ geo, plo, PlotRange -> All]

enter image description here

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