You better throw in a little interpolation in that recipe:

 sphere {
   0.0, 1
   texture {
     pigment {
        image_map {
           jpeg "earth.jpg"
           once
           map_type 1
           interpolate 4
        }
     }
   }
 }

Note that the info in the docs regarding interpolation was probably written on a
bad day. Type 4 is what people should use in general since it delivers smoother
results (which is a good thing).

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