[seqfan] Re: Value of A248424 in the OEIS

Felix Fröhlich felix.froe at gmail.com
Mon Sep 18 18:52:53 CEST 2017


Okay, thanks for the submission.

Best regards
Felix

2017-09-18 18:16 GMT+02:00 M. F. Hasler <oeis at hasler.fr>:

> On Mon, Sep 18, 2017 at 10:57 AM, Felix Fröhlich <felix.froe at gmail.com>
> wrote:
>
> > Dear SeqFans,
> >
> > A248424 gives the decimal expansion of the value of 1 Parsec in meters.
> > According to Wikipedia, (https://en.wikipedia.org/wiki/Parsec), since
> > 2005,
> >
>
> no : since August 2015 !
>
>
> > 1 Parsec is defined to be exactly (648000 / Pi) astronomical units (AU).
> > The AU itself is defined to be exactly 149597870700 meters. With this, I
> > get
> > 1 Parsec = (648000/Pi) * 149597870700 =
> > 30856775814913672.789139379577964716107319211604092.... meters.
> >
> > Why does this value differ from the value given in A248424? Why does
> > A248424 give a different definition (see for example the comment by M. F.
> > Hasler)? Who is correct?
> >
>
> This was done in 2014 when the 2012 definition was in vigor.
>
> Now I have amended the definition of the sequence (proposed) to clarify
> this.
> Wikipedia was incorrect in so far as it still wrote in the first line (I
> just fixed this, too)
>
>  " A parsec is the distance at which one astronomical unit subtends an
> > angle of one arcsecond."
>
>
> although it is now defined to be exactly (648000 / Pi) astronomical units
> (AU),
> which is* not * the distance at which one astronomical unit subtends an
> angle of one arcsecond."
>
> I suggested the new value as the new sequence A292525.
> (I think the sequence data should not be changed as this was done e.g. for
> A163103, cf.
> https://oeis.org/history?seq=A163103&start=10
> in so far more as in the present case, it would lose interesting nontrivial
> properties inherent to the former definition.
>
> --Maximilian
>
> --
> Seqfan Mailing list - http://list.seqfan.eu/
>


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