"SharkD" <pos### [at] gmailcom> schreef in bericht 
news:4c214569$1@news.povray.org...
> Interesting flyby video:
>
> http://www.youtube.com/watch?v=OXZdaQN3r50
>
> I didn't realize a) that the sun was so large WRT the ring, and b) that 
> the inner "shadow" ring was so much nearer the outer ring than the sun.
>

Nice animation indeed, but:
The shadow squares are wrong. According to Niven, they are located at the 
equivalent of the orbit of Mercury, if the ring were at Earth's distance.

Have you seen the Rama animation?

Five years ago, I distilled the following parameters for the Ringworld 
system:

 RINGWORLD parameters conversion table


      scale factor
     1,00
      sun diameter mi 1.000.000,00

     km 1.610.000,00
      ring radius mi 95.000.000,00

     km 152.950.000,00
      ring width mi 997.000,00

     km 1.605.170,00
      rim wall height mi 1.000,00

     km 1.610,00
      shadow square radius mi 13.000.000,00

     km 20.930.000,00
      shadow square width mi 1.000.000,00

     km 1.610.000,00
      shadow square length mi 2.500.000,00

     km 4.025.000,00
      spill mountain height (1) mi 30,00

     km 48,30
      spill mountain height (2) mi 40,00

     km 64,40



Thomas

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