They could all be correct depending on the assumptions. Your position on the earth and the distance to the to the moon constantly varies. Examine what each of the three programs assume for the reflection point on the moon and your position on the earth.toggle quoted messageShow quoted text
From: main@WSJTX.groups.io <main@WSJTX.groups.io> On Behalf Of Michael Black via groups.io
Sent: Sunday, September 25, 2022 22:31
To: WSJTX Group <email@example.com>
Subject: [WSJTX] Moon Dx #general
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?