Can anybody tell me if there is a theoretical limit to the size/distance
calculations in pov?

I'm trying to do a scene inspired by the videogame Halo, but  my
gas-giant is the size of Jupiter (1 unit = 1 inch.) yet it copletely
disappears from less than 170 miles out.  Unless i'm much mistaken, an
object that size should be vizible from several thousand miles distant.

/*
 Persistence of Vision Ray Tracer Scene Description File
 File: RingWorld.pov
 Vers: 3.5
 Desc:
 Date: 10/17/02
 Auth: Anthony D. Baye
*/

#include "colors.inc"
#include "textures.inc"

#declare ft = 12 ;
#declare mi = 5280*ft ;


camera {
 location  <0.0, 0.0, -36405.0*mi>
 look_at   <0.0, 0.0, 0.0>
 }

light_source { <0.0, 0.0, -36405.0*mi> color rgb 1.0 }

#declare Metal1 =
finish {
 roughness 0.007
    metallic
    brilliance 0.5
    ambient 0.1
    diffuse 0.4375
    brilliance 2
    reflection { 0.25 metallic fresnel on }
    phong 0.5
    phong_size 175
    conserve_energy
 }

object {
 union {
  sphere { 0.0, 36250.0*mi }
/*  difference {
   torus { 4000.0*mi, 1000.0*mi  }
//   torus { 4000.0*mi, 997.0*mi texture { T_Gold_5A } }
   cylinder { <0.0, -1000.00390625*mi, 0.0> <0.0, 1000.00390625*mi, 0.0>
4994.98731061*mi }
    pigment { Red*0.4375 }
    finish { Metal1 }
     rotate <72, 18.0, 0.0>
     translate <0.0, 0.0, -200000.0*mi>
//     rotate <0.0, 18.0, -6.0>
   }*/
  }
  pigment { White*0.625 }
 }

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