Sun radius of light =

just point at camera should keep shadows consistent where you see them, around
the camera.

#declare _x_ = vnormalize(vcross(y,campos))*val(elements[0][7])/5;
#declare _y_ = vnormalize(vcross(campos,_x_))*val(elements[0][7])/5;

#if (10)
light_source { 0 color rgb <.9,.9,.8>*1
    area_light _x_,_y_, 4,4 adaptive 0 jitter orient circular
    }
#else
light_source{
  <0,0,0>,
  0.8
}
#end

15 minutes into 3:15 duration eclipse.

//Feb 21 2008 02:03:00
#declare JulianDate = 2454517.58542;
#declare ctime = 1203559380;

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