camera {
  location  <0.0, 0.0, -2.25*planetRadius>
  look_at   <0.0, 0.0,  0.0>
  right     x*image_width/image_height
}


Change your x and y for look_at a bit and see what happens


#declare isoSmooth = isosurface {
  function {f_sphere(x, y, z, planetRadius)}
  contained_by { sphere { 0, planetRadius+maxHeightAboveSea} }
  threshold 0.0
  accuracy 0.1
  max_gradient 1.1
  max_trace 1
}

I'd say my first instinct is to drastically reduce accuracy to 0.0000001

I'd also see about giving the sphere a slightly different finish to reduce the
harsh shadow effect.  Play with diffuse, etc.

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