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
> 
> 
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