Thomas de Groot <tho### [at] degrootorg> wrote:
> On 13-10-2013 0:41, posfan12 wrote:
> > "posfan12" <nomail@nomail> wrote:
> >> One thing I'd like to know is how many shadow squares are there supposed to be?
> >>
> >> If they're supposed to be 2500000 miles long and 13000000 miles from the center
> >> of the sun, then there should be 41 of them assuming they're spaced equally
> >> apart.
> >>
> >> Is that right?
> >
> > Damn my math!
> >
> > That should be ~16 not 41.
> >
>
> According to my macro there are 20. 18 degrees from shadow square center
> to shadow square center; 360/18. I don't remember if this is mentioned
> in Larry Niven's books but it might be.

It is mentioned, once, and I believe the number is indeed 20. He also specifies
their orbit radius, which is sufficient information to render them correctly
(assuming night and day are of equal length).

Bill

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