William,
Change? No.
Be more accurately measured? Yes.
But enough to change EME calculations in WSJT-X? No idea, that is why
I asked the question.
"Compared to the previous general-purpose ephemerides DE430, seven
years of new data have been added to compute DE440 and DE441, with improved
dynamical models and data calibration. "
Ref: https://iopscience.iop.org/article/10.3847/1538-3881/abd414
But I'm certain about the leap second thing. :)
Warren
On Wed, Aug 18, 2021, 12:43 PM William Smith via wsjt-devel <
wsjt-devel@lists.sourceforge.net> wrote:
> I can't easily determine how the accuracy of the two files differs, but
> does the moon change it's orbital parameters that much in 23 years?
>
> 73, Willie N1JBJ
>
>
> > On Aug 18, 2021, at 3:27 AM, halsteaw--- via wsjt-devel <
> wsjt-devel@lists.sourceforge.net> wrote:
> >
> > (Not an astronomer)
> >
> > I noticed in the contrib/Ephemeris folder that the JPLEPH file is
> > DE405 which was created back in 1997.
> > (Ref: https://ssd.jpl.nasa.gov/?planet_eph_export )
> >
> > Is there a reason that such old data is being used?
> >
> > For the best EME and other calculations, shouldn't DE440 which was
> > created June 2020 be used?
> >
> > -ALSO-
> >
> > lib/slasubs.f is missing the data for the Leap Second for Jan 1 2017 @
> line 161
> > (Ref: https://www.ietf.org/timezones/data/leap-seconds.list )
> >
> > Respectfully,
> >
> > ~W. Halstead
> >
> >
> > _______________________________________________
> > wsjt-devel mailing list
> > wsjt-devel@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/wsjt-devel
>
>
>
> _______________________________________________
> wsjt-devel mailing list
> wsjt-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/wsjt-devel
>
_______________________________________________
wsjt-devel mailing list
wsjt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
