NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
USNO bug
From: Bill Ritchie
Date: 2022 May 16, 13:00 -0700
From: Bill Ritchie
Date: 2022 May 16, 13:00 -0700
A user of my software reported a large discrepancy with the USNO "Celestial Navigation Data for Assumed Position and Time" in the declination of Jupiter for 14th May. Checking revealed that the USNO data reverses the N/S Name when the true declination lies between -1.0 and 0.0 degrees, as this graph shows.
[NO IMAGE]
Not only Jupiter! The same occurs with all solar system bodies, including the Sun on 2022.03.18 after 02:54:00 UT, the Moon on 2022.03.19 after 02:17:00 UT and Venus on 2022.05.03 after 07:57:00 UT. (The longitude needs to be varied to get the body above the horizon at the given times.) There are no navigational stars in that declination range, so they remain correct.
Does any NavList contributor know a real person there to report this to?
Regards,
Bill Ritchie.
50N 003W
