I forgot to add, that discrepancies may arise between programs that use a 6
character grid locator to define your home location, and JPL Horizons where
you can enter your exact location, due to the potential inaccuracy in
determining your exact location from a 6 digit Maidenhead locator.
We see this sometimes on microwave EME, where the computed Doppler shifts
may be a few Hz out. Similar effects might well happen with moon
distance. Its all negligible, however!
On Mon, 26 Sept 2022 at 10:57, Michael Black via groups.io <mdblack98=
I had an older version of PSTRotator and they agree much better now with
17.28 -- differing by around 100km as of right now so only 0.026% between
MoonCalc is now the odd one out and off by approx 3900km but I imagine
they are doing the orbital distance and not surface-to-surface.
On Sunday, September 25, 2022 at 06:51:13 PM CDT, Svend, OZ7UV <
I just got this answer:
The displayed Moon distance is now the distance between your location and
the Moon surface.
It is still a difference around 100km between PstRotator and WSJT-X, and I
will try to find the reason.
Codrut - YO3DMU
man. 26. sep. 2022 01.02 skrev Michael Black via groups.io <mdblack98=
Trying to determine accuracy of moon distance.
Using WSJTX Astronomy window, PSTRotator and https://www.mooncalc.org
All 3 seem to agree pretty well on Az and El but distance is off by about
5000km comparing WSJTX to the others.
As of 13:00 or so I see
The equatorial radius of the moon is 1,738km so that doesn't explain the
difference (of about 1.3%).
It seems the code in wsjtx was done with certain deliberation so I'm
hoping WSJTX is more accurate. But how to resolve who's right?