There is a much better solution.

//start code

#local sp = SunPos(2013, 6, 6, 17, 0, 0, 52.206507, 0.12165);

light_source {
   sp
   color rgb <1,1,0.9>*(17334 * EXP)
}

#local SunRadius = vlength(sp/1000)/214.8;
sphere {sp/1000, SunRadius pigment{color rgb 1} finish{emission 1} 
no_shadow}

//end code

The scene does not need the *emission* of the *visible* sphere as a 
light source. It only needs the light source itself. So, the solution is 
to put the sunlight at the standard SunPos position, and the *visible* 
sphere and its radius at sp/1000. In addition, just make emission of the 
sphere equal to 1.

See attached image.

Thomas

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