Problems Caused by Altitude = 90° in the Search Field

[MrRG2024]

Problems Caused by Altitude = 90° in the Search Field

I wanted to display the entire visible sky in stereographic projection, centered with north at the bottom of the screen.
To do this, I entered the position azimuth = 0° and altitude = 90° in the search field (azimuthal).

Stellarium 26.2 (Windows 11) then does some strange things.

1. The image jumps back and forth (though sometimes it doesn’t), even when I enter a different azimuth.
2. You can’t change the azimuth values using the v and ^ fields.
3. The v and ^ fields for altitude only change the sign.

Perhaps an angle function is causing problems at an altitude of 90°.

One more question: Is it possible to display the numerical values of the compass markings in the view even below the horizon?

[gzotti]

The usual cause. up_vector||view_vector. This is specially handled by a keypress sequence of "Look into Zenith" (Shift-Z) and "Look towards North" (Shift-N). Apparently the Search dialog has not yet implemented this special case.

The numerical compass marks (Shift-Q) are plotted after the landscape, so are visible. You cannot shift their positions. If you want to see the azimuthal grid below the landscape, you can now make the landscape semitransparent.

[MrRG2024]

@ gzotti: Thanks, I didn't know those keyboard shortcuts before!

I also just discovered that checking all three boxes under “Horizon” displays exactly what I want: degrees below the horizon (I always use a zero horizon). So I don't need the compass markings at all.